First slide

Inheritance of Two Genes

Question

Identify the incorrect statement regarding linkage.

Easy

A

Linkage between genes increases recombination.
B

Linkage between genes causes them to be inherited together.
C

In linkage the maximum frequency of recombinant gametes is 50%.
D

In a testcross for two linked genes, each crossover produces two recombinant gametes and two nonrecombinants gametes.

Solution

Linkage between genes causes them to be inherited together and reduces recombination; crossing over breaks up the associations of such genes. In a testcross for two linked genes, each crossover produces two recombinant gametes and two nonrecombinants. The frequency of recombinant gametes is half the frequency of crossing over, and the maximum frequency of recombinant gametes is 50%.

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