Genetics: A Conceptual Approach
Genetics: A Conceptual Approach
6th Edition
ISBN: 9781319050962
Author: Benjamin A. Pierce
Publisher: W. H. Freeman
Question
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Chapter 2.2, Problem 1TPSQ
Summary Introduction

To explain:

The reason whether the genetic information from two sister chromatids is passed from a single parent or both the parents.

Introduction:

A sister chromatid depicts the chromatid which is formed by a chromosome’s replication. Both the copies are attached to a centromere which is common.

Expert Solution & Answer
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Explanation of Solution

Sister chromatid is also known as one half of the chromosome which is duplicated. Dyad is a term which is known for a pair of sister chromatids. A complete set of chromatids (sister) is formed at the time of Interphase synthesis phase, when there is replication of the cell.

The sister chromatids get separated into 2 different cells at the time of meiosis or mitosis. The sister chromatids are large and identical because they carry same alleles of genes as they are derived from a single chromosome. Hence, if a chromosome consist of two sister chromatids, then it is clear that it is derived from a single parent’s original chromosome.

Conclusion

The genetic information from two sister chromatids is passed from a single parent as the sister chromatids are the duplicated chromatids of the original chromosome.

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