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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Students have asked these similar questions
Meiosis is characterized by the pairing of homologouschromosomes during prophase I. In many species, an elaboratestructure called the synaptonemal complex forms betweenhomologues. During this pairing, homologues may exchangechromosomal material at sites called chiasmata. In meiosis I, thehomologues separate from each other, reducing the chromosomenumber to the haploid state (thus the reductive division). It isfollowed by a second division without replication, during whichsister chromatids become separated. The result of meiosis I and IIis four haploid cells. If sister chromatids separated at the first division, would meiosis still work?
Contrast the genetic content and the origin of sister versus nonsisterchromatids during their earliest appearance in prophase Iof meiosis. How might the genetic content of these change by thetime tetrads have aligned at the equatorial plate during metaphaseI?
During metaphase I of meiosis, tetrads align along the metaphase plate independently of each other. Therefore, there is a random “shuffle” of maternal and paternal chromosomes in the resulting gametes.The following diagram demonstrates how this works in a diploid cell with four chromosomes (2n=4) . Because there are two pairs of chromosomes and each pair can align in one of two ways during metaphase I, the number of possible variations in the gametes produced is 22 or 4.For an organism that is , there are three pairs of chromosomes, so the number of possible variations in the gametes produced due to independent assortment in metaphase I is 23 or 8. In an organism with a haploid number of 7, how many possible combinations of maternal and paternal chromosomes can occur in its gametes?   a. 72=49 b. 27=128 c.17=1 d. 214=16 384

Chapter 13 Solutions

Genetic Analysis: An Integrated Approach (2nd Edition)

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