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Chapter 7: Problem 25

Are sister chromatid exchanges effective in producing genetic variability in an individual? in the offspring of individuals?

Short Answer

Expert verified
Explain your answer. Answer: No, sister chromatid exchanges do not effectively produce genetic variability in an individual or their offspring. This is because the exchanged DNA segments occur between identical copies of the same chromosome, which have the same genetic information. Genetic variability in offspring mainly arises from mutations, recombination events, and chromosomal rearrangements during meiosis.

Step by step solution

01

Understand sister chromatid exchanges

Sister chromatid exchanges are the process by which two sister chromatids (identical copies of a single chromosome) exchange DNA segments during cell division (mitosis or meiosis). This process typically occurs during the DNA repair mechanism and helps to maintain genomic stability.
02

Examine the role of sister chromatid exchanges in genetic variability

Genetic variability is the basis of diversity among individuals and is essential for evolution and adaptation to changing environments. Genetic variability arises from different sources, such as mutations, recombination, and chromosomal rearrangements. Sister chromatid exchanges might seem like a potential source of genetic variability since they involve exchanging DNA segments between chromatids.
03

Analyze the effect of sister chromatid exchanges in an individual

Sister chromatid exchanges occur during the cell division process in an organism. However, these exchanges occur between sister chromatids, which are identical copies of the same chromosome, meaning the exchanged segments have the same genetic information. Therefore, sister chromatid exchanges do not contribute to genetic variability within an individual.
04

Analyze the effect of sister chromatid exchanges on offspring

Genetic variation in offspring arises mainly through the process of meiosis, which forms gametes (sperm and egg cells) in sexually reproducing organisms. During meiosis, chromosomes from both the mother and father recombine and are passed randomly to the offspring, creating unique combinations of genetic material. While sister chromatid exchanges can occur during meiotic cell division, they still involve the exchange of genetic material between identical copies of chromosomes, and thus, do not introduce new genetic variation to the offspring.
05

Conclusion

In conclusion, sister chromatid exchanges are not effective in producing genetic variability in an individual or their offspring, as the exchanged DNA segments are between identical copies of the same chromosome. The main sources of genetic variability in offspring come from mutations, recombination events, and chromosomal rearrangements during meiosis.

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Most popular questions from this chapter

A female of genotype \\[ \frac{a}{+++} \\] produces 100 meiotic tetrads. Of these, 68 show no crossover events. Of the remaining 32,20 show a crossover between \(a\) and \(b\), 10 show a crossover between \(b\) and \(c,\) and 2 show a double crossover between \(a\) and \(b\) and between \(b\) and \(c .\) Of the 400 gametes produced, how many of each of the eight different genotypes will be produced? Assuming the order \(a-b-c\) and the allele arrangement shown above, what is the map distance between these loci?

In Drosophila, Dichaete ( \(D\) ) is a mutation on chromosome III with a dominant effect on wing shape. It is lethal when homozygous. The genes \(e\)bony body \((e)\) and pink eye (p) are recessive mutations on chromosome III. Flies from a Dichaete stock were crossed to homozygous ebony, pink flies, and the \(\mathrm{F}_{1}\) progeny with a Dichaete phenotype were backcrossed to the ebony, pink homozygotes. (a) Using the results of this backcross shown in the following table, diagram the cross, showing the genotypes of the parents and offspring of both crosses. (b) What is the sequence and interlocus distance between these three genes?

Why are double-crossover events expected less frequently than single-crossover events?

In Drosophila, the two mutations Stubble bristles (Sb) and curled wings ( $c u$ ) are linked on chromosome III. Sb is a dominant gene that is lethal in a homozygous state, and \(c u\) is a recessive gene. If a female of the genotype \\[ \frac{S b}{+} \\] is to be mated to detect recombinants among her offspring, what male genotype would you choose as her mate?

In Creighton and McClintock's experiment demonstrating that crossing over involves physical exchange between chromosomes (see Section 7.6 ), explain the importance of the cytological markers (the translocated segment and the chromosome knob) in the experimental rationale.
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