In which parent could chromosomal rearrangement have made an x chromosome with 2 fur color alleles?


Question: In which parent could chromosomal rearrangement have made an x chromosome with 2 fur color alleles?

In this blog post, I will explain how a chromosomal rearrangement could result in an X chromosome with two fur color alleles in cats. Fur color in cats is determined by two genes: the orange gene (O) and the non-aggressive gene (A). The orange gene is located on the X chromosome, while the non-aggressive gene is on an autosome. Normally, female cats have two X chromosomes, one from each parent, and male cats have one X and one Y chromosome. However, sometimes a chromosomal rearrangement can occur, where a piece of one chromosome breaks off and attaches to another chromosome. This can create a new combination of genes on the same chromosome.


One possible scenario is that a piece of an autosome containing the non-aggressive gene (A) breaks off and attaches to an X chromosome containing the orange gene (O). This would create an X chromosome with two fur color alleles: O and A. If this happened in a female cat, she would have one normal X chromosome and one rearranged X chromosome. Depending on which X chromosome is inactivated in each cell, she could have patches of orange fur and patches of non-aggressive fur. If this happened in a male cat, he would have a Y chromosome and a rearranged X chromosome. He would have orange fur and non-aggressive behavior.


The question is, in which parent could this chromosomal rearrangement have occurred? The answer is that it could have occurred in either parent, but it is more likely to have occurred in the father. This is because the father only has one X chromosome, so any change in that chromosome would affect all his offspring. The mother has two X chromosomes, so a change in one of them would only affect half of her offspring. Therefore, if we see a cat with a rearranged X chromosome, it is more probable that it came from the father than from the mother.

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