Explain the role of gene flow in the biological species concept.

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Answer 1

Textbook Question

Chapter 24, Problem 24.1CR

Explain the role of gene flow in the biological species concept.

Expert Solution & Answer

Summary Introduction

To review: The importance of gene flow with respect to the biological species concept.

Introduction:

According to the “Biological species concept”, a group of individuals with interbreeding members to produce a viable offspring is called “species”. “Gene flow” occurs by the transfer of alleles between individuals of a species, and this exchange of alleles tends to hold the individuals together genetically. Human beings are one of the best examples of the “biological species concept”.

Explanation of Solution

In the “biological species concept”, the members of a species become reproductively isolated through prezygotic and postzygotic barriers and thus produce a fertile offspring. These members do not breed with the members of other species. As the interruption of the gene flow is must for the production of a new species, but here the members of different species are not interbreeding; therefore, the gene flow is completely masked between different populations. Hence, in the “biological species concept”, there is a complete absence of gene flow.

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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…

Question #5: Assume that two genes are identified that confer gametophytic facultative apomixis in soybean. The genes show independent assortment. Recessive alleles at both loci are required for the facultative apomixis. Facultative apomixis is triggered when the temperature at pollination is above 20 degrees C. At temperatures below 20 degrees C, all reproduction is sexual, independent of genotype. A facultative apomict male, capable of producing viable pollen, was crossed with a sexually reproducing female. Assuming the parents are completely inbred, what are the predicted phenotypic ratios (apomict: non-apomict) for the F1, F2, and DH (F1-derived) generations at each of the following temperatures*: a) 15°C? b) 25°C? *for full credit, show crosses and genotypes where appropriate. Remember to position the female first (left side) in the cross. Type your answer here:

Answer 2

Textbook Question

Chapter 24, Problem 24.1CR

Explain the role of gene flow in the biological species concept.

Expert Solution & Answer

Summary Introduction

To review: The importance of gene flow with respect to the biological species concept.

Introduction:

According to the “Biological species concept”, a group of individuals with interbreeding members to produce a viable offspring is called “species”. “Gene flow” occurs by the transfer of alleles between individuals of a species, and this exchange of alleles tends to hold the individuals together genetically. Human beings are one of the best examples of the “biological species concept”.

Explanation of Solution

In the “biological species concept”, the members of a species become reproductively isolated through prezygotic and postzygotic barriers and thus produce a fertile offspring. These members do not breed with the members of other species. As the interruption of the gene flow is must for the production of a new species, but here the members of different species are not interbreeding; therefore, the gene flow is completely masked between different populations. Hence, in the “biological species concept”, there is a complete absence of gene flow.

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Answer 3

Textbook Question

Chapter 24, Problem 24.1CR

Explain the role of gene flow in the biological species concept.

Expert Solution & Answer

Summary Introduction

To review: The importance of gene flow with respect to the biological species concept.

Introduction:

According to the “Biological species concept”, a group of individuals with interbreeding members to produce a viable offspring is called “species”. “Gene flow” occurs by the transfer of alleles between individuals of a species, and this exchange of alleles tends to hold the individuals together genetically. Human beings are one of the best examples of the “biological species concept”.

Explanation of Solution

In the “biological species concept”, the members of a species become reproductively isolated through prezygotic and postzygotic barriers and thus produce a fertile offspring. These members do not breed with the members of other species. As the interruption of the gene flow is must for the production of a new species, but here the members of different species are not interbreeding; therefore, the gene flow is completely masked between different populations. Hence, in the “biological species concept”, there is a complete absence of gene flow.

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03:18

Answer 4

Textbook Question

Chapter 24, Problem 24.1CR

Explain the role of gene flow in the biological species concept.

Expert Solution & Answer

Summary Introduction

To review: The importance of gene flow with respect to the biological species concept.

Introduction:

According to the “Biological species concept”, a group of individuals with interbreeding members to produce a viable offspring is called “species”. “Gene flow” occurs by the transfer of alleles between individuals of a species, and this exchange of alleles tends to hold the individuals together genetically. Human beings are one of the best examples of the “biological species concept”.

Explanation of Solution

In the “biological species concept”, the members of a species become reproductively isolated through prezygotic and postzygotic barriers and thus produce a fertile offspring. These members do not breed with the members of other species. As the interruption of the gene flow is must for the production of a new species, but here the members of different species are not interbreeding; therefore, the gene flow is completely masked between different populations. Hence, in the “biological species concept”, there is a complete absence of gene flow.

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Answer 5

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Answer 6

Textbook Question

Answer 7

Expert Solution & Answer

Summary Introduction

To review: The importance of gene flow with respect to the biological species concept.

Introduction:

According to the “Biological species concept”, a group of individuals with interbreeding members to produce a viable offspring is called “species”. “Gene flow” occurs by the transfer of alleles between individuals of a species, and this exchange of alleles tends to hold the individuals together genetically. Human beings are one of the best examples of the “biological species concept”.

Explanation of Solution

In the “biological species concept”, the members of a species become reproductively isolated through prezygotic and postzygotic barriers and thus produce a fertile offspring. These members do not breed with the members of other species. As the interruption of the gene flow is must for the production of a new species, but here the members of different species are not interbreeding; therefore, the gene flow is completely masked between different populations. Hence, in the “biological species concept”, there is a complete absence of gene flow.

Answer 8

Expert Solution & Answer

Summary Introduction

To review: The importance of gene flow with respect to the biological species concept.

Introduction:

According to the “Biological species concept”, a group of individuals with interbreeding members to produce a viable offspring is called “species”. “Gene flow” occurs by the transfer of alleles between individuals of a species, and this exchange of alleles tends to hold the individuals together genetically. Human beings are one of the best examples of the “biological species concept”.

Explanation of Solution

In the “biological species concept”, the members of a species become reproductively isolated through prezygotic and postzygotic barriers and thus produce a fertile offspring. These members do not breed with the members of other species. As the interruption of the gene flow is must for the production of a new species, but here the members of different species are not interbreeding; therefore, the gene flow is completely masked between different populations. Hence, in the “biological species concept”, there is a complete absence of gene flow.

Answer 9

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Answer 10

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Answer 11

Summary Introduction

To review: The importance of gene flow with respect to the biological species concept.

Introduction:

According to the “Biological species concept”, a group of individuals with interbreeding members to produce a viable offspring is called “species”. “Gene flow” occurs by the transfer of alleles between individuals of a species, and this exchange of alleles tends to hold the individuals together genetically. Human beings are one of the best examples of the “biological species concept”.

Answer 12

Explanation of Solution

In the “biological species concept”, the members of a species become reproductively isolated through prezygotic and postzygotic barriers and thus produce a fertile offspring. These members do not breed with the members of other species. As the interruption of the gene flow is must for the production of a new species, but here the members of different species are not interbreeding; therefore, the gene flow is completely masked between different populations. Hence, in the “biological species concept”, there is a complete absence of gene flow.