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Chapter 8: Problem 7

An inversion heterozygote has the following inverted chromosome: What would be the products if a crossover occurred between genes \(H\) and \(I\) on the inverted chromosome and a normal chromosome?

Short Answer

Expert verified
The products of a crossover between genes \(H\) and \(I\) on an inverted chromosome and a normal chromosome would be one chromosome with a normal sequence segment replaced by an inverted sequence, and an inverted chromosome with a segment in the normal sequence. However, these products may not be functionally viable due to the abnormal gene formations.

Step by step solution

01

Understand the configuration of the inverted chromosome

First, one should visualize the inverted chromosome and its genetic material arrangement. The example does not provide a specific arrangement, but let's assume that a typical chromosome has the arrangement \(ABCDEF\) and the inverted chromosome has the arrangement \(AFEDCB\). Specified in the question, genes \(H\) and \(I\) (equivalent to say, \(D\) and \(E\) in our assumption) are considered for crossover.
02

Understand the process of crossing over between an inverted and normal chromosome

Crossing over, during which genetic material is exchanged, occurs during meiosis between an inverted and a normal homologous chromosome. The inverted chromosome forms a loop to align the homologous region with the normal chromosome. In the context of our assumption, the chromosomes align in a loop form, presenting the possibility of exchanging gene D and E between the inversion heterozygote (inverted chromosome) and the normal chromosome.
03

Predict the result of the crossover

After crossing over occurs, the chromosomes are broken at the H and I genes (or say, D and E genes) and the intervening segments are exchanged. Rejoining results the normal chromosome carrying the inverted segment and the inverted chromosome carrying the segment in the normal sequence. But it's crucial to note, the crossover of the genes in these segments results in a configuration that is not normally present. These chromosomes may not be functional and lead to gametes that are lacking essential genes, reducing the overall genetic viability.

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Most popular questions from this chapter

An inversion heterozygote has the following inverted chromosome: What would be the products if a crossover occurred between genes \(H\) and \(I\) on the inverted chromosome and a normal chromosome?

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