A Double Heterozygote for Two Linked Genes in the Mouse

question 56

Multiple Choice

A double heterozygote for two linked genes in the mouse is test-crossed by crossing it to a homozygous recessive parent. In the offspring, the two parental classes appear in a frequency of 45% each, and the two recombinant classes appear in a frequency of 5% each. What is the distance in map units between the two genes?

• A) 45 m.u.
• B) 22.5 m.u.
• C) 10 m.u.
• D) 5 m.u.
• E) 2.5 m.u.

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