Genetic Analysis: An Integrated Approach (2nd Edition)
Genetic Analysis: An Integrated Approach (2nd Edition)
2nd Edition
ISBN: 9780321948908
Author: Mark F. Sanders, John L. Bowman
Publisher: PEARSON
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Chapter 13, Problem 1P
Summary Introduction

To review:

In the given question, it is asked to identify characteristics of homologous chromosomes synapsis which can be used to distinguish between two plant species. Plant species A (Diploid) possesses 36 chromosomes and plant species B (Triploid) also possesses 36 chromosomes.

Introduction:

Prophase-1 is a phase in the process of germ cell division (meiosis) in which duplicated chromosome gets condensed and aligns with their homologous chromosome. This pairing between two homologous partners is followed by a crossing over which results in genetic recombination (exchange of genetic material between pair of homologous chromosomes).

The organism which possesses a pair of homologous chromosomes in its somatic cell is termed as a diploid organism. Similarly, the organism possessing three homologous chromosomes in its somatic cell is termed as a triploid organism.

Expert Solution & Answer
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Explanation of Solution

Genetic Analysis: An Integrated Approach (2nd Edition), Chapter 13, Problem 1P , additional homework tip  1

According to the given information, species-A is diploid and possesses 36 chromosomes; here, the possible number of pair of homologous chromosomes is 18 and no unpaired or trivalent chromosome is present in prophase.

Genetic Analysis: An Integrated Approach (2nd Edition), Chapter 13, Problem 1P , additional homework tip  2

According to the given information, species-B is triploid and possesses 36 chromosomes; here the possible number of triplets could be 12 and prophase may possess an unpaired chromosome, a pair of homologous chromosome, and triplets.

Genetic Analysis: An Integrated Approach (2nd Edition), Chapter 13, Problem 1P , additional homework tip  3 Diagram-Triploid cell with unpaired chromosome, a pair of homologous chromosome, and trivalent.

Conclusion

In species-A, the possible number of pair of homologous chromosomes is 36 and no unpaired or trivalent chromosome is present in prophase.

In species-B, the possible number of triplets could be 12 and prophase may possess an unpaired chromosome, pair of homologous chromosome, and trivalent.

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Genetic Analysis: An Integrated Approach (2nd Edition)

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