Genetics: Analysis and Principles
Genetics: Analysis and Principles
6th Edition
ISBN: 9781259616020
Author: Robert J. Brooker Professor Dr.
Publisher: McGraw-Hill Education
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Chapter 20, Problem 1CONQ

Describe the similarities and differences between homologous recombination involving sister chromatid exchange (SCE) and that involving homologs. Would you expect the same types of proteins to be involved in both processes? Explain.

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Summary Introduction

To review:

The similarities and differences between the recombination and the sister chromatid exchange in respect of homologs. The explanation about the same type of proteins that are involved in these processes.

Introduction:

Amino acids are the building blocks of proteins that play a significant role in an organism’s body by carrying out many functions like providing structure to the cells and help in regulating the mechanism of organs and tissues. The chemical composition of proteins was first described by Gerardus Johannes Mulder.

Explanation of Solution

Homologous recombination is a type of genetic recombination, which helps in repairing of breaks inside DNA (deoxyribonucleic acid) strands. In this process, the sequences of nucleotides are exchanged between the two identical molecules of DNA. The sister chromatid exchange is a type of exchange, in which the exchange of genetic material occurs between the two similar sister chromatids. The similarities and differences between homologous recombination and sister chromatid exchange are given below:-

Differences:-

Homologous recombination Sister-chromatid exchange
Homologous recombination gives rise to new allele combinations, after the crossing over process Sister chromatid exchange no new allele formation occurs because the chromatids are similar.

Similarities:-

The sister chromatid exchange and homologous recombination show some similarities at their molecular level. In both the processes, the segment of genetic material or DNA first follows the lineup part and then undergo the crossing over process, in this way they show resemblance.

The sister chromatid exchange and homologous recombination show resemblance at the molecular level, so, both the processes involve the same type of proteins for carrying their role.

Conclusion

Therefore, it can be concluded that both processes show some similarities and resemblances on different levels, and it is estimated that both the processes are carried out by the same type of proteins.

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Students have asked these similar questions
A chromosome of genotype   C D recombines with a homolog of genotype   c d during meiosis when Spo11 produces a double-strand break between genes   C and   D. If anticrossover helicase disentangles the invading strand, the likely outcome would be             A)   two   C D and two   c d gametes.                      B)   two   C d and two   c D gametes.            C)   one   C D, one   C d, one   c D, and one   c d gamete.            D)   four   C D gametes.            E)   four   c d gametes
Two strains of   S. cerevisae (yeast) are crossed. One has the genotype   A B and the other   a b. Which statement correctly describes the tetrads that can be produced by one reciprocal exchange between the   A and   B genes without gene conversion in the dihybrid?             A)   Recombination occurs at the four-strand stage to produce a tetrad with   A B, A B, a B, and   a b chromosomes.                        B)   Recombination occurs at the four-strand stage to produce a tetrad with   A B, A b, a B, and   a b chromosomes.            C)   Recombination occurs at the two-strand stage to produce a tetrad with   A B, A b, a B, and   a b chromosomes.            D)   Recombination occurs at the two-strand stage to produce a tetrad with   A b, A b, a B, and   a B chromosomes.
Hundreds of DNA double strand breaks are created by SPO11, a topoisomerase type II like protein. (i) Draw and explain how SPO11 can generate double strand breaks. (ii) What would be the consequences to the outcome of meiosis if SPO11 is absent? Explain your reason.

Chapter 20 Solutions

Genetics: Analysis and Principles

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genetic recombination strategies of bacteria CONJUGATION, TRANSDUCTION AND TRANSFORMATION; Author: Scientist Cindy;https://www.youtube.com/watch?v=_Va8FZJEl9A;License: Standard youtube license