Genes E and H are syntenic in an experimental organism w...

Question

Genes E and H are syntenic in an experimental organism with the genotype EH/eh. Assume that during each meiosis, one crossover occurs between these genes. No homologous chromosomes escape crossover, and none undergo double crossover. Are genes E and H genetically linked? Why or why not? What is the proportion of parental gametes produced by meiosis?

Accepted Answer

Hello, everyone. And welcome to today's video. I suppose that two genes are located in the same chromosome and they undergo crossing over with another homologous chromosome. If the frequency of gaines containing all in the of configuration is 48% each and the frequency of gamine containing recoin and configuration is 2% each. Which of the following conclusions is therefore true. As answer choice A we have each gene is located at the opposite ends as answer choice B we have the two genes are located close to each other as answer choice C, we have the chromosome has too many genes as answer choice. D we have the homologous chromosome did not undergo crossing over. So there's something just very simple that we can refer to. In order to solve this problem, we know that if the frequency of the gas containing the parental configuration is more than 25% then this, this is indicating genetic linkage in the problem. We are told that this parental configuration has a frequency of 48% which is a lot more than what the minimum of 25% is going to be. So these genes are definitely linked. Now, if these genes are linked, remember from previous videos, it's because they're going to be very close to each other in the chromosome. And therefore the correct answer for this question is going to be answer choice. B the two genes are located close to each other. I really hope this video helped you and I hope to see you on the next one.

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