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Chapter 6: Problem 9

By conducting testcrosses, researchers have found that the sweet pea has seven linkage groups. How many chromosomes would you expect to find in leaf cells of the plants?

Short Answer

Expert verified
Based on the above-discussed steps, one would expect to find seven chromosomes in leaf cells of the sweet pea plants.

Step by step solution

01

Understanding Linkage Groups

In genetics, a linkage group is equal to the number of chromosomes. A set of genes or markers that tend to be inherited together are on the same chromosome, which forms a linkage group.
02

Apply the Knowledge to the Context

Researchers have found that the sweet pea has seven linkage groups. As each linkage group corresponds to one chromosome, sweet pea therefore has seven chromosomes.

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Most popular questions from this chapter

Researchers have discovered that some regions of chromosomes are much more likely than others to cross over. We might call such a region a "hot spot" for crossing over. Let's suppose that two genes, gene \(A\) and gene \(B\), are \(5,000,000 \mathrm{bp}\) apart on the same chromosome. Genes \(A\) and \(B\) are in a hot spot for crossing over. Two other genes, let's call them gene \(C\) and gene \(D\), are also \(5,000,000 \mathrm{bp}\) apart but are not in a hot spot for recombination. If we conducted two-factor crosses to compute the map distance between genes \(A\) and \(B\) and other two-factor crosses to compute the map distance between genes \(C\) and \(D\), would the calculated map distance between \(A\) and \(B\) be the same as that between \(C\) and \(D\) ? Explain.

What is the difference in meaning between the terms genetic recombination and crossing over?

What is mitotic recombination? A heterozygous individual \((B b)\) with brown eyes has one eye with a small patch of blue. Provide two or more explanations for how the blue patch may have occurred.

When a chi square analysis is applied to solve a linkage problem, explain why an independent assortment hypothesis is proposed.

In most two-factor crosses involving linked genes, we cannot tell if a double crossover between the two genes has occurred because the offspring will inherit the nonrecombinant pattern of alleles. How does the inability to detect double crossovers affect the calculation of map distance? Is map distance underestimated or overestimated because of our inability to detect double crossovers? Explain your answer.
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