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Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892

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BuyFindarrow_forward

Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

The degree of relatedness between a parent and its biological offspring:

a. is the same as that between full siblings.

b. is less than that between brother and sister.

c. depends on how many siblings the parent has.

d. promotes an individual’s reproductive success.

e. is the same as between first cousins.

Summary Introduction

Introduction:

Degree of relatedness is the percentage of alleles that are common between two individuals.

Explanation

Justification/explanation for the correct answer:

Option (a) says that degree of relatedness between parents and their biological offspring is same as that of full siblings. Each parent contributes one copy of allele to its offspring, hence allelic composition of offspring matches 50% of that of each parent. Siblings share 25% of alleles from each parent making it overall 50 % in between them. The two values are equal. Hence, option (a) is correct.

The explanation for the incorrect answers:

Option (b) says that degree of relatedness between parent and its biological offspring is less than that between brother and sister. Degree of relatedness between parent and its biological offspring is 50%. Also, siblings share 50% of allelic composition. As brother and sister are siblings, so degree of relatedness is 50%. The value is equal to that of between parent and its biological offspring...

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