In guinea pigs, a single gene with two alleles (B and b) determines coat color.

Question

In guinea pigs, a single gene with two alleles (B and b) determines coat color. Black (B) is dominant over white (b). A guinea pig from a true-breeding black strain is mated with a guinea pig from a true-breeding white strain. The F1 progeny are all black, Two of the F1 progeny are mated with each other. What proportion of the black F2 progeny is expected to be heterozygous? Oa 113 Ob. 1/2 Oc 2/4 Od. 1/4 QUESTION 31 What is the probability that the following pair of parents will produce the indicated offspring (assuming independent assortment)? DdEEFf x DdEEFF >ddEEF O a 1/8 Oc 1/16 Od. 1/4 Oe. 1/32

Explanation / Answer

2/3 (or 66%) of the black F2 individuals will be heterozygous. 2 Bb offspring for every 1 BB offspring that is produced, 2/3 of the black F2 individuals will be heterozygous.  

1/4 x 1/4 x 1/2 = 1/32?,that is the probability

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