7. Consider two genes with the alleles A and a and B and b . If the two genes ar

Question

7. Consider two genes with the alleles A and a and B and b. If the two genes are 30 m.u. apart what gametes will an individual with the genotype AB/ab be expected to produce?

A. 35% will contain A and B alleles, 35% will contain a and b alleles, 15 % will contain A and b, and 15% will contain a and B

B. 25% of each of the following allele combinations: A and B, A and b, a and B and a and b

C. 20% will contain A and B alleles, 20% will contain a and b alleles, 30% will contain A and b alleles, and 30% will contain a and B alleles

D. 35% will contain A and b, 35% will contain a and B, 15% will contain A and B, and 15% will contain a and b

E. 30% will contain A and B, 30% will contain a and b, 20% will contain A and b, and 20% will contain a and B.

Consider the two genes described in Question 7. What is the probability of obtaining a double heterozygote in the cis configuration from the following cross: Ab x/aB AB?/ab

Explanation / Answer

7)

(a) 35% will contain A and B alleles, 35% will contain a and b alleles, 15 % will contain A and b, and 15% will contain a and B

You perform the following cross and are told that the two genes are 30 m.u. apart.

A B/a b x a b/a b

Among their progeny, 30 percent should be recombinant (A b/a b and a B/a b), therefore Ab / ab should represent 1/2 of recombinants or 15%.

and 70 percent should be parental (A B/a b & a b/a b), therefore, A B/a b should represent 1/2 of the parentals or 35%.

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