Why are protists considered paraphyletic? a. They include many extinct forms, including lineages that no longer have any living representatives. b. They include some but not all descendants of their most recent common ancestor. c. They represent all of the descendants of a single common ancestor. d. Not all protists have all of the synapomorphies that define the Eukarya, such as a nucleus.

Question

Want to see more full solutions like this?

Answer 1

Textbook Question

Chapter 27, Problem 1TYK

Why are protists considered paraphyletic?

a. They include many extinct forms, including lineages that no longer have any living representatives.

b. They include some but not all descendants of their most recent common ancestor.

c. They represent all of the descendants of a single common ancestor.

d. Not all protists have all of the synapomorphies that define the Eukarya, such as a nucleus.

Expert Solution & Answer

Summary Introduction

Introduction:

A protist refers to any eukaryotic organism that has a cell with distinct nucleic acids and other membrane-covered structures. They do not form a clade or a natural group.

Answer to Problem 1TYK

Correct answer:

Therefore, protists are considered paraphyletic as this organism group includes only the most recent common ancestors as their descendants.

Explanation of Solution

Explanation/justification for the correct answer:

Option (b) is given as the protists include only some descendants of their recent common ancestors. The protists are the unicellular eukaryotes. This group of organisms is simple, but very diverse. These organisms do not have common ancestors. They possess different cellular structures, varying life cycles as well as different locomotion modes. They possess characteristics of plants or animals or both. Hence, Option (b) is correct.

Explanation for incorrect answer:

Option (a) is given as they involve extinct forms including the lineages that do not have any living representatives. After studying different protists at the molecular level, it has been found that they do not have common ancestors. The protists have characteristics of the descendants of some of their recent common ancestors. So, it is a wrong answer.

Option (c) is given as they show all the descendants of a single common ancestor. The taxa, which represents the protists does not include all descendants of all of their ancestors. This means that they are paraphyletic and not monophyletic. So, it is a wrong answer.

Option (d) is given as not all protists consist of synapomorphies, which describe the eukarya like the nucleus. Therefore, the protists are paraphyletic because they include only some descendants of a single common ancestor. They do not include lineages that no longer have any living representatives. The protists are those eukaryotes that are neither animals, plants, nor fungi, but they all possess a well-defined nucleus. So, it is a wrong answer.

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

Conclusion

Therefore, it can be concluded that the protists are known as paraphyletic because they involve some descendants of their recent common ancestor.

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!

Students have asked these similar questions

H gene assorts independently from the I gene. Both on autosomes. One man and one woman, both of HhIAIB genotype. Determine the blood type of progeny and fractions out of 16

Alleles at the P locus control seed color. Plants which are pp have white seeds, white flowers and no pigment in vegetative parts. Plants which are P_ have black seeds, purple flowers and may have varying degrees of pigment on stems and leaves. Seed color can be assessed, visually, based on if the seed is white or not white A gene for mold resistance has been reported and we want to determine its inheritance and whether it is linked to P. For the purposes of this exercise, we will assume that resistance is controlled by a single locus M, and M_ plants are resistant and mm plants are susceptible. Resistance can be measured, under greenhouse conditions, 2 weeks after planting, by injecting each seedling with a spore suspension. After two weeks, the seedlings can be rated as resistant or susceptible, based on whether or not tissue is actively sporulating. For this exercise we will use seed and data from the F10 generation of a recombinant inbred population produced using single seed…

Linkage in common bean Alleles at the P locus control seed color. Plants which are pp have white seeds, white flowers and no pigment in vegetative parts. Plants which are P_ have black seeds, purple flowers and may have varying degrees of pigment on stems and leaves. Seed color can be assessed, visually, based on if the seed is white or not white A gene for mold resistance has been reported and we want to determine its inheritance and whether it is linked to P. For the purposes of this exercise, we will assume that resistance is controlled by a single locus M, and M_ plants are resistant and mm plants are susceptible. Resistance can be measured, under greenhouse conditions, 2 weeks after planting, by injecting each seedling with a spore suspension. After two weeks, the seedlings can be rated as resistant or susceptible, based on whether or not tissue is actively sporulating. For this exercise we will use seed and data from the F10 generation of a recombinant inbred population…

Answer 2

Textbook Question

Chapter 27, Problem 1TYK

Why are protists considered paraphyletic?

a. They include many extinct forms, including lineages that no longer have any living representatives.

b. They include some but not all descendants of their most recent common ancestor.

c. They represent all of the descendants of a single common ancestor.

d. Not all protists have all of the synapomorphies that define the Eukarya, such as a nucleus.

Expert Solution & Answer

Summary Introduction

Introduction:

A protist refers to any eukaryotic organism that has a cell with distinct nucleic acids and other membrane-covered structures. They do not form a clade or a natural group.

Answer to Problem 1TYK

Correct answer:

Therefore, protists are considered paraphyletic as this organism group includes only the most recent common ancestors as their descendants.

Explanation of Solution

Explanation/justification for the correct answer:

Option (b) is given as the protists include only some descendants of their recent common ancestors. The protists are the unicellular eukaryotes. This group of organisms is simple, but very diverse. These organisms do not have common ancestors. They possess different cellular structures, varying life cycles as well as different locomotion modes. They possess characteristics of plants or animals or both. Hence, Option (b) is correct.

Explanation for incorrect answer:

Option (a) is given as they involve extinct forms including the lineages that do not have any living representatives. After studying different protists at the molecular level, it has been found that they do not have common ancestors. The protists have characteristics of the descendants of some of their recent common ancestors. So, it is a wrong answer.

Option (c) is given as they show all the descendants of a single common ancestor. The taxa, which represents the protists does not include all descendants of all of their ancestors. This means that they are paraphyletic and not monophyletic. So, it is a wrong answer.

Option (d) is given as not all protists consist of synapomorphies, which describe the eukarya like the nucleus. Therefore, the protists are paraphyletic because they include only some descendants of a single common ancestor. They do not include lineages that no longer have any living representatives. The protists are those eukaryotes that are neither animals, plants, nor fungi, but they all possess a well-defined nucleus. So, it is a wrong answer.

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

Conclusion

Therefore, it can be concluded that the protists are known as paraphyletic because they involve some descendants of their recent common ancestor.

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 3

Textbook Question

Chapter 27, Problem 1TYK

Why are protists considered paraphyletic?

a. They include many extinct forms, including lineages that no longer have any living representatives.

b. They include some but not all descendants of their most recent common ancestor.

c. They represent all of the descendants of a single common ancestor.

d. Not all protists have all of the synapomorphies that define the Eukarya, such as a nucleus.

Expert Solution & Answer

Summary Introduction

Introduction:

A protist refers to any eukaryotic organism that has a cell with distinct nucleic acids and other membrane-covered structures. They do not form a clade or a natural group.

Answer to Problem 1TYK

Correct answer:

Therefore, protists are considered paraphyletic as this organism group includes only the most recent common ancestors as their descendants.

Explanation of Solution

Explanation/justification for the correct answer:

Option (b) is given as the protists include only some descendants of their recent common ancestors. The protists are the unicellular eukaryotes. This group of organisms is simple, but very diverse. These organisms do not have common ancestors. They possess different cellular structures, varying life cycles as well as different locomotion modes. They possess characteristics of plants or animals or both. Hence, Option (b) is correct.

Explanation for incorrect answer:

Option (a) is given as they involve extinct forms including the lineages that do not have any living representatives. After studying different protists at the molecular level, it has been found that they do not have common ancestors. The protists have characteristics of the descendants of some of their recent common ancestors. So, it is a wrong answer.

Option (c) is given as they show all the descendants of a single common ancestor. The taxa, which represents the protists does not include all descendants of all of their ancestors. This means that they are paraphyletic and not monophyletic. So, it is a wrong answer.

Option (d) is given as not all protists consist of synapomorphies, which describe the eukarya like the nucleus. Therefore, the protists are paraphyletic because they include only some descendants of a single common ancestor. They do not include lineages that no longer have any living representatives. The protists are those eukaryotes that are neither animals, plants, nor fungi, but they all possess a well-defined nucleus. So, it is a wrong answer.

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

Conclusion

Therefore, it can be concluded that the protists are known as paraphyletic because they involve some descendants of their recent common ancestor.

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 4

Textbook Question

Chapter 27, Problem 1TYK

Why are protists considered paraphyletic?

a. They include many extinct forms, including lineages that no longer have any living representatives.

b. They include some but not all descendants of their most recent common ancestor.

c. They represent all of the descendants of a single common ancestor.

d. Not all protists have all of the synapomorphies that define the Eukarya, such as a nucleus.

Expert Solution & Answer

Summary Introduction

Introduction:

A protist refers to any eukaryotic organism that has a cell with distinct nucleic acids and other membrane-covered structures. They do not form a clade or a natural group.

Answer to Problem 1TYK

Correct answer:

Therefore, protists are considered paraphyletic as this organism group includes only the most recent common ancestors as their descendants.

Explanation of Solution

Explanation/justification for the correct answer:

Option (b) is given as the protists include only some descendants of their recent common ancestors. The protists are the unicellular eukaryotes. This group of organisms is simple, but very diverse. These organisms do not have common ancestors. They possess different cellular structures, varying life cycles as well as different locomotion modes. They possess characteristics of plants or animals or both. Hence, Option (b) is correct.

Explanation for incorrect answer:

Option (a) is given as they involve extinct forms including the lineages that do not have any living representatives. After studying different protists at the molecular level, it has been found that they do not have common ancestors. The protists have characteristics of the descendants of some of their recent common ancestors. So, it is a wrong answer.

Option (c) is given as they show all the descendants of a single common ancestor. The taxa, which represents the protists does not include all descendants of all of their ancestors. This means that they are paraphyletic and not monophyletic. So, it is a wrong answer.

Option (d) is given as not all protists consist of synapomorphies, which describe the eukarya like the nucleus. Therefore, the protists are paraphyletic because they include only some descendants of a single common ancestor. They do not include lineages that no longer have any living representatives. The protists are those eukaryotes that are neither animals, plants, nor fungi, but they all possess a well-defined nucleus. So, it is a wrong answer.

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

Conclusion

Therefore, it can be concluded that the protists are known as paraphyletic because they involve some descendants of their recent common ancestor.

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

Textbook Question

Answer 6

Textbook Question

Answer 7

Expert Solution & Answer

Summary Introduction

Introduction:

A protist refers to any eukaryotic organism that has a cell with distinct nucleic acids and other membrane-covered structures. They do not form a clade or a natural group.

Answer to Problem 1TYK

Correct answer:

Therefore, protists are considered paraphyletic as this organism group includes only the most recent common ancestors as their descendants.

Explanation of Solution

Explanation/justification for the correct answer:

Option (b) is given as the protists include only some descendants of their recent common ancestors. The protists are the unicellular eukaryotes. This group of organisms is simple, but very diverse. These organisms do not have common ancestors. They possess different cellular structures, varying life cycles as well as different locomotion modes. They possess characteristics of plants or animals or both. Hence, Option (b) is correct.

Explanation for incorrect answer:

Option (a) is given as they involve extinct forms including the lineages that do not have any living representatives. After studying different protists at the molecular level, it has been found that they do not have common ancestors. The protists have characteristics of the descendants of some of their recent common ancestors. So, it is a wrong answer.

Option (c) is given as they show all the descendants of a single common ancestor. The taxa, which represents the protists does not include all descendants of all of their ancestors. This means that they are paraphyletic and not monophyletic. So, it is a wrong answer.

Option (d) is given as not all protists consist of synapomorphies, which describe the eukarya like the nucleus. Therefore, the protists are paraphyletic because they include only some descendants of a single common ancestor. They do not include lineages that no longer have any living representatives. The protists are those eukaryotes that are neither animals, plants, nor fungi, but they all possess a well-defined nucleus. So, it is a wrong answer.

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

Conclusion

Therefore, it can be concluded that the protists are known as paraphyletic because they involve some descendants of their recent common ancestor.

Answer 8

Expert Solution & Answer

Summary Introduction

Introduction:

A protist refers to any eukaryotic organism that has a cell with distinct nucleic acids and other membrane-covered structures. They do not form a clade or a natural group.

Answer to Problem 1TYK

Correct answer:

Therefore, protists are considered paraphyletic as this organism group includes only the most recent common ancestors as their descendants.

Explanation of Solution

Explanation/justification for the correct answer:

Option (b) is given as the protists include only some descendants of their recent common ancestors. The protists are the unicellular eukaryotes. This group of organisms is simple, but very diverse. These organisms do not have common ancestors. They possess different cellular structures, varying life cycles as well as different locomotion modes. They possess characteristics of plants or animals or both. Hence, Option (b) is correct.

Explanation for incorrect answer:

Option (a) is given as they involve extinct forms including the lineages that do not have any living representatives. After studying different protists at the molecular level, it has been found that they do not have common ancestors. The protists have characteristics of the descendants of some of their recent common ancestors. So, it is a wrong answer.

Option (c) is given as they show all the descendants of a single common ancestor. The taxa, which represents the protists does not include all descendants of all of their ancestors. This means that they are paraphyletic and not monophyletic. So, it is a wrong answer.

Option (d) is given as not all protists consist of synapomorphies, which describe the eukarya like the nucleus. Therefore, the protists are paraphyletic because they include only some descendants of a single common ancestor. They do not include lineages that no longer have any living representatives. The protists are those eukaryotes that are neither animals, plants, nor fungi, but they all possess a well-defined nucleus. So, it is a wrong answer.

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

Conclusion

Therefore, it can be concluded that the protists are known as paraphyletic because they involve some descendants of their recent common ancestor.

Answer 9

Expert Solution & Answer

Answer 10

Expert Solution & Answer

Answer 11

Summary Introduction

Introduction:

A protist refers to any eukaryotic organism that has a cell with distinct nucleic acids and other membrane-covered structures. They do not form a clade or a natural group.

Answer 12

Answer to Problem 1TYK

Correct answer:

Therefore, protists are considered paraphyletic as this organism group includes only the most recent common ancestors as their descendants.

Answer 13

Explanation of Solution

Explanation/justification for the correct answer:

Option (b) is given as the protists include only some descendants of their recent common ancestors. The protists are the unicellular eukaryotes. This group of organisms is simple, but very diverse. These organisms do not have common ancestors. They possess different cellular structures, varying life cycles as well as different locomotion modes. They possess characteristics of plants or animals or both. Hence, Option (b) is correct.

Explanation for incorrect answer:

Option (a) is given as they involve extinct forms including the lineages that do not have any living representatives. After studying different protists at the molecular level, it has been found that they do not have common ancestors. The protists have characteristics of the descendants of some of their recent common ancestors. So, it is a wrong answer.

Option (c) is given as they show all the descendants of a single common ancestor. The taxa, which represents the protists does not include all descendants of all of their ancestors. This means that they are paraphyletic and not monophyletic. So, it is a wrong answer.

Option (d) is given as not all protists consist of synapomorphies, which describe the eukarya like the nucleus. Therefore, the protists are paraphyletic because they include only some descendants of a single common ancestor. They do not include lineages that no longer have any living representatives. The protists are those eukaryotes that are neither animals, plants, nor fungi, but they all possess a well-defined nucleus. So, it is a wrong answer.

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