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Principles Of Inheritance And Variation

Question

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Which of the, following statements is not true of two genes that show 50% recombination frequency?

the genes may be on different chromosomes

the genes are tightly linked

the genes show independent assortment

if the genes are present on the same chromosome, they undergo more than one cross overs in every meiosis

Solution

B.

the genes are tightly linked

The tightly linked genes on chromosomes show 100% parental types and 0% recombinants. Two genes that undergo independent assortment indicated by a recombinant frequency of 50% are either on non- homologous chromosomes or located far apart in a single chromosome. As the distance between two genes increases, crossover frequency increases. More recombinant gametes, fewer parental gametes.

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