Biodiversity is defined as the richness of the living systems present at all the levels of biological organization . The biodiversity consists of genetic variation within a population and between the populations at the basic level.

Question

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Answer 1

Question

Chapter 55, Problem 1TYK

Summary Introduction

Introduction:

Biodiversity is defined as the richness of the living systems present at all the levels of biological organization. The biodiversity consists of genetic variation within a population and between the populations at the basic level.

Expert Solution & Answer

Answer to Problem 1TYK

Correct answer:

The greatest extinction in the history of life on the earth might be occurring now.

Explanation of Solution

Justification for the correct answer:

Option (e) states that ‘the greatest extinction on the earth may be occurring now.’ The biodiversity is now declining rapidly. It is occurring much faster than it might have occurred in the history of the earth. The reasons behind the greatest extinction are threats to the biodiversity. There are three major threats to biodiversity, namely deforestation, over-exploitation of fish population, and alteration of freshwater ecosystems. Hence, option (e) is correct.

Justification for the incorrect answers:

Option (a) states that ‘the greatest extinction on the earth occurred at the end of the Permian period.’ The Permian period ended with a Permian–Triassic extinction event, in which nearly 96% of the marine species and 70% of the terrestrial vertebrates became extinct. The present day extinction is going at a faster pace than the Permian period’s extinction. So, it is an incorrect option.

Option (b) states that ‘the greatest extinction on the earth occurred at the end of the Cretaceous period.’ The Cretaceous period ended with the event of Cretaceous–Paleogene extinction, which led to the non-avian dinosaurs, large marine reptiles, and pterosaurs extinction. It is still not the greatest extinction in the history of the earth. So, it is an incorrect option.

Option (c) states that ‘at the end of the Ordovician period, the greatest extinction occurred on the earth.’ The Ordovician period ended with the Ordovician–Silurian extinction event, which led to the extinction of invertebrates including mollusks and arthropods. This did not end with mass extinction. So, it is an incorrect option.

Option (d) states that ‘the greatest extinction took place at the end of the Cambrian era.’ The Cambrian era ended with the Cambrian–Ordovician extinction event, in which many brachiopods and conodonts got extinct. The greatest extinction did not take place at the end of this era. So, it is an incorrect option.

Hence, options (a), (b), (c), and (d) are incorrect.

Conclusion

Thus, it can be concluded that the greatest extinction might be occurring now and did not take place at the end of the Permian, Cretaceous, Ordovician, and Cambrian era. The current extinction is taking place due to human activities.

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Question #3: In the KeyGene paper, the authors state that it would be useful if pollen from an apomict would transmit apomixis-inducing genes to the female in the cross (assuming the pollen is viable). Assuming there was just one gene conferring gametophytic obligate apomixis, and that the two parents are inbreds, what would be the consequences of such a cross if: a) The apomixis was a dominant trait? Indicate the genotypes and phenotypes (apomict or non- apomict) of the parents, F1 and F2 generations. Remember to include the expected genotypic and phenotypic ratios (or percentages) in the F1 and F2 generations, and to position the female first (left side) in the parental cross. b) The apomixis was a recessive trait? Indicate the genotypes and phenotypes (apomict or non- apomict) of the parents, F1 and F2 generations. Remember to include the expected genotypic and phenotypic ratios (or percentages) in the F1 and F2 generations, and to position the female first (left side) in the…

Answer 2

Question

Chapter 55, Problem 1TYK

Summary Introduction

Introduction:

Biodiversity is defined as the richness of the living systems present at all the levels of biological organization. The biodiversity consists of genetic variation within a population and between the populations at the basic level.

Expert Solution & Answer

Answer to Problem 1TYK

Correct answer:

The greatest extinction in the history of life on the earth might be occurring now.

Explanation of Solution

Justification for the correct answer:

Option (e) states that ‘the greatest extinction on the earth may be occurring now.’ The biodiversity is now declining rapidly. It is occurring much faster than it might have occurred in the history of the earth. The reasons behind the greatest extinction are threats to the biodiversity. There are three major threats to biodiversity, namely deforestation, over-exploitation of fish population, and alteration of freshwater ecosystems. Hence, option (e) is correct.

Justification for the incorrect answers:

Option (a) states that ‘the greatest extinction on the earth occurred at the end of the Permian period.’ The Permian period ended with a Permian–Triassic extinction event, in which nearly 96% of the marine species and 70% of the terrestrial vertebrates became extinct. The present day extinction is going at a faster pace than the Permian period’s extinction. So, it is an incorrect option.

Option (b) states that ‘the greatest extinction on the earth occurred at the end of the Cretaceous period.’ The Cretaceous period ended with the event of Cretaceous–Paleogene extinction, which led to the non-avian dinosaurs, large marine reptiles, and pterosaurs extinction. It is still not the greatest extinction in the history of the earth. So, it is an incorrect option.

Option (c) states that ‘at the end of the Ordovician period, the greatest extinction occurred on the earth.’ The Ordovician period ended with the Ordovician–Silurian extinction event, which led to the extinction of invertebrates including mollusks and arthropods. This did not end with mass extinction. So, it is an incorrect option.

Option (d) states that ‘the greatest extinction took place at the end of the Cambrian era.’ The Cambrian era ended with the Cambrian–Ordovician extinction event, in which many brachiopods and conodonts got extinct. The greatest extinction did not take place at the end of this era. So, it is an incorrect option.

Hence, options (a), (b), (c), and (d) are incorrect.

Conclusion

Thus, it can be concluded that the greatest extinction might be occurring now and did not take place at the end of the Permian, Cretaceous, Ordovician, and Cambrian era. The current extinction is taking place due to human activities.

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Answer 3

Question

Chapter 55, Problem 1TYK

Summary Introduction

Introduction:

Biodiversity is defined as the richness of the living systems present at all the levels of biological organization. The biodiversity consists of genetic variation within a population and between the populations at the basic level.

Expert Solution & Answer

Answer to Problem 1TYK

Correct answer:

The greatest extinction in the history of life on the earth might be occurring now.

Explanation of Solution

Justification for the correct answer:

Option (e) states that ‘the greatest extinction on the earth may be occurring now.’ The biodiversity is now declining rapidly. It is occurring much faster than it might have occurred in the history of the earth. The reasons behind the greatest extinction are threats to the biodiversity. There are three major threats to biodiversity, namely deforestation, over-exploitation of fish population, and alteration of freshwater ecosystems. Hence, option (e) is correct.

Justification for the incorrect answers:

Option (a) states that ‘the greatest extinction on the earth occurred at the end of the Permian period.’ The Permian period ended with a Permian–Triassic extinction event, in which nearly 96% of the marine species and 70% of the terrestrial vertebrates became extinct. The present day extinction is going at a faster pace than the Permian period’s extinction. So, it is an incorrect option.

Option (b) states that ‘the greatest extinction on the earth occurred at the end of the Cretaceous period.’ The Cretaceous period ended with the event of Cretaceous–Paleogene extinction, which led to the non-avian dinosaurs, large marine reptiles, and pterosaurs extinction. It is still not the greatest extinction in the history of the earth. So, it is an incorrect option.

Option (c) states that ‘at the end of the Ordovician period, the greatest extinction occurred on the earth.’ The Ordovician period ended with the Ordovician–Silurian extinction event, which led to the extinction of invertebrates including mollusks and arthropods. This did not end with mass extinction. So, it is an incorrect option.

Option (d) states that ‘the greatest extinction took place at the end of the Cambrian era.’ The Cambrian era ended with the Cambrian–Ordovician extinction event, in which many brachiopods and conodonts got extinct. The greatest extinction did not take place at the end of this era. So, it is an incorrect option.

Hence, options (a), (b), (c), and (d) are incorrect.

Conclusion

Thus, it can be concluded that the greatest extinction might be occurring now and did not take place at the end of the Permian, Cretaceous, Ordovician, and Cambrian era. The current extinction is taking place due to human activities.

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Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Answer 4

Question

Chapter 55, Problem 1TYK

Summary Introduction

Introduction:

Biodiversity is defined as the richness of the living systems present at all the levels of biological organization. The biodiversity consists of genetic variation within a population and between the populations at the basic level.

Expert Solution & Answer

Answer to Problem 1TYK

Correct answer:

The greatest extinction in the history of life on the earth might be occurring now.

Explanation of Solution

Justification for the correct answer:

Option (e) states that ‘the greatest extinction on the earth may be occurring now.’ The biodiversity is now declining rapidly. It is occurring much faster than it might have occurred in the history of the earth. The reasons behind the greatest extinction are threats to the biodiversity. There are three major threats to biodiversity, namely deforestation, over-exploitation of fish population, and alteration of freshwater ecosystems. Hence, option (e) is correct.

Justification for the incorrect answers:

Option (a) states that ‘the greatest extinction on the earth occurred at the end of the Permian period.’ The Permian period ended with a Permian–Triassic extinction event, in which nearly 96% of the marine species and 70% of the terrestrial vertebrates became extinct. The present day extinction is going at a faster pace than the Permian period’s extinction. So, it is an incorrect option.

Option (b) states that ‘the greatest extinction on the earth occurred at the end of the Cretaceous period.’ The Cretaceous period ended with the event of Cretaceous–Paleogene extinction, which led to the non-avian dinosaurs, large marine reptiles, and pterosaurs extinction. It is still not the greatest extinction in the history of the earth. So, it is an incorrect option.

Option (c) states that ‘at the end of the Ordovician period, the greatest extinction occurred on the earth.’ The Ordovician period ended with the Ordovician–Silurian extinction event, which led to the extinction of invertebrates including mollusks and arthropods. This did not end with mass extinction. So, it is an incorrect option.

Option (d) states that ‘the greatest extinction took place at the end of the Cambrian era.’ The Cambrian era ended with the Cambrian–Ordovician extinction event, in which many brachiopods and conodonts got extinct. The greatest extinction did not take place at the end of this era. So, it is an incorrect option.

Hence, options (a), (b), (c), and (d) are incorrect.

Conclusion

Thus, it can be concluded that the greatest extinction might be occurring now and did not take place at the end of the Permian, Cretaceous, Ordovician, and Cambrian era. The current extinction is taking place due to human activities.

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Answer 5

Chapter 55, Problem 1TYK

Summary Introduction

Introduction:

Biodiversity is defined as the richness of the living systems present at all the levels of biological organization. The biodiversity consists of genetic variation within a population and between the populations at the basic level.

Expert Solution & Answer

Answer to Problem 1TYK

Correct answer:

The greatest extinction in the history of life on the earth might be occurring now.

Explanation of Solution

Justification for the correct answer:

Option (e) states that ‘the greatest extinction on the earth may be occurring now.’ The biodiversity is now declining rapidly. It is occurring much faster than it might have occurred in the history of the earth. The reasons behind the greatest extinction are threats to the biodiversity. There are three major threats to biodiversity, namely deforestation, over-exploitation of fish population, and alteration of freshwater ecosystems. Hence, option (e) is correct.

Justification for the incorrect answers:

Option (a) states that ‘the greatest extinction on the earth occurred at the end of the Permian period.’ The Permian period ended with a Permian–Triassic extinction event, in which nearly 96% of the marine species and 70% of the terrestrial vertebrates became extinct. The present day extinction is going at a faster pace than the Permian period’s extinction. So, it is an incorrect option.

Option (b) states that ‘the greatest extinction on the earth occurred at the end of the Cretaceous period.’ The Cretaceous period ended with the event of Cretaceous–Paleogene extinction, which led to the non-avian dinosaurs, large marine reptiles, and pterosaurs extinction. It is still not the greatest extinction in the history of the earth. So, it is an incorrect option.

Option (c) states that ‘at the end of the Ordovician period, the greatest extinction occurred on the earth.’ The Ordovician period ended with the Ordovician–Silurian extinction event, which led to the extinction of invertebrates including mollusks and arthropods. This did not end with mass extinction. So, it is an incorrect option.

Option (d) states that ‘the greatest extinction took place at the end of the Cambrian era.’ The Cambrian era ended with the Cambrian–Ordovician extinction event, in which many brachiopods and conodonts got extinct. The greatest extinction did not take place at the end of this era. So, it is an incorrect option.

Hence, options (a), (b), (c), and (d) are incorrect.

Conclusion

Thus, it can be concluded that the greatest extinction might be occurring now and did not take place at the end of the Permian, Cretaceous, Ordovician, and Cambrian era. The current extinction is taking place due to human activities.

Answer 6

Chapter 55, Problem 1TYK

Summary Introduction

Introduction:

Biodiversity is defined as the richness of the living systems present at all the levels of biological organization. The biodiversity consists of genetic variation within a population and between the populations at the basic level.

Expert Solution & Answer

Answer to Problem 1TYK

Correct answer:

The greatest extinction in the history of life on the earth might be occurring now.

Explanation of Solution

Justification for the correct answer:

Option (e) states that ‘the greatest extinction on the earth may be occurring now.’ The biodiversity is now declining rapidly. It is occurring much faster than it might have occurred in the history of the earth. The reasons behind the greatest extinction are threats to the biodiversity. There are three major threats to biodiversity, namely deforestation, over-exploitation of fish population, and alteration of freshwater ecosystems. Hence, option (e) is correct.

Justification for the incorrect answers:

Option (a) states that ‘the greatest extinction on the earth occurred at the end of the Permian period.’ The Permian period ended with a Permian–Triassic extinction event, in which nearly 96% of the marine species and 70% of the terrestrial vertebrates became extinct. The present day extinction is going at a faster pace than the Permian period’s extinction. So, it is an incorrect option.

Option (b) states that ‘the greatest extinction on the earth occurred at the end of the Cretaceous period.’ The Cretaceous period ended with the event of Cretaceous–Paleogene extinction, which led to the non-avian dinosaurs, large marine reptiles, and pterosaurs extinction. It is still not the greatest extinction in the history of the earth. So, it is an incorrect option.

Option (c) states that ‘at the end of the Ordovician period, the greatest extinction occurred on the earth.’ The Ordovician period ended with the Ordovician–Silurian extinction event, which led to the extinction of invertebrates including mollusks and arthropods. This did not end with mass extinction. So, it is an incorrect option.

Option (d) states that ‘the greatest extinction took place at the end of the Cambrian era.’ The Cambrian era ended with the Cambrian–Ordovician extinction event, in which many brachiopods and conodonts got extinct. The greatest extinction did not take place at the end of this era. So, it is an incorrect option.

Hence, options (a), (b), (c), and (d) are incorrect.

Conclusion

Thus, it can be concluded that the greatest extinction might be occurring now and did not take place at the end of the Permian, Cretaceous, Ordovician, and Cambrian era. The current extinction is taking place due to human activities.

Answer 7

Chapter 55, Problem 1TYK

Summary Introduction

Introduction:

Biodiversity is defined as the richness of the living systems present at all the levels of biological organization. The biodiversity consists of genetic variation within a population and between the populations at the basic level.

Answer 8

Expert Solution & Answer

Answer to Problem 1TYK

Correct answer:

The greatest extinction in the history of life on the earth might be occurring now.

Answer 9

Expert Solution & Answer

Answer 10

Expert Solution & Answer

Answer 11

Explanation of Solution

Justification for the correct answer:

Option (e) states that ‘the greatest extinction on the earth may be occurring now.’ The biodiversity is now declining rapidly. It is occurring much faster than it might have occurred in the history of the earth. The reasons behind the greatest extinction are threats to the biodiversity. There are three major threats to biodiversity, namely deforestation, over-exploitation of fish population, and alteration of freshwater ecosystems. Hence, option (e) is correct.

Justification for the incorrect answers:

Option (a) states that ‘the greatest extinction on the earth occurred at the end of the Permian period.’ The Permian period ended with a Permian–Triassic extinction event, in which nearly 96% of the marine species and 70% of the terrestrial vertebrates became extinct. The present day extinction is going at a faster pace than the Permian period’s extinction. So, it is an incorrect option.

Option (b) states that ‘the greatest extinction on the earth occurred at the end of the Cretaceous period.’ The Cretaceous period ended with the event of Cretaceous–Paleogene extinction, which led to the non-avian dinosaurs, large marine reptiles, and pterosaurs extinction. It is still not the greatest extinction in the history of the earth. So, it is an incorrect option.

Option (c) states that ‘at the end of the Ordovician period, the greatest extinction occurred on the earth.’ The Ordovician period ended with the Ordovician–Silurian extinction event, which led to the extinction of invertebrates including mollusks and arthropods. This did not end with mass extinction. So, it is an incorrect option.

Option (d) states that ‘the greatest extinction took place at the end of the Cambrian era.’ The Cambrian era ended with the Cambrian–Ordovician extinction event, in which many brachiopods and conodonts got extinct. The greatest extinction did not take place at the end of this era. So, it is an incorrect option.

Hence, options (a), (b), (c), and (d) are incorrect.

Answer 12

Conclusion

Thus, it can be concluded that the greatest extinction might be occurring now and did not take place at the end of the Permian, Cretaceous, Ordovician, and Cambrian era. The current extinction is taking place due to human activities.

Answer 13

Ch. 55.1 - Prob. 1SB Ch. 55.1 - Prob. 2SB Ch. 55.1 - Prob. 3SB Ch. 55.2 - Prob. 1SB Ch. 55.2 - Prob. 2SB Ch. 55.3 - How does biodiversity serve as a storehouse of...Ch. 55.3 - Prob. 2SB Ch. 55.4 - Prob. 1SB Ch. 55.4 - Prob. 2SB Ch. 55.4 - Why are conservation biologists especially...

Biodiversity is defined as the richness of the living systems present at all the levels of biological organization . The biodiversity consists of genetic variation within a population and between the populations at the basic level.

Concept explainers

Videos

Introduction:

Biodiversity is defined as the richness of the living systems present at all the levels of biological organization. The biodiversity consists of genetic variation within a population and between the populations at the basic level.

Answer to Problem 1TYK

Explanation of Solution

Want to see more full solutions like this?

Chapter 55 Solutions

Biodiversity is defined as the richness of the living systems present at all the levels of biological organization . The biodiversity consists of genetic variation within a population and between the populations at the basic level.

Concept explainers

Videos

Introduction: Biodiversity is defined as the richness of the living systems present at all the levels of biological organization. The biodiversity consists of genetic variation within a population and between the populations at the basic level.

Answer to Problem 1TYK

Explanation of Solution

Want to see more full solutions like this?

Chapter 55 Solutions

Introduction:

Biodiversity is defined as the richness of the living systems present at all the levels of biological organization. The biodiversity consists of genetic variation within a population and between the populations at the basic level.