Suppose that gene A is on the X chromosome, and genes B, C, and
D are on three different autosomes. A- signifies the dominant
phenotype. An equivalent situation holds for B-. C-, and D-. The
cross AABBCCDD females by aYbbccdd males is made.
A. What is the frequency of ‘A-‘ individulas in the F1?
Explain
B. What is the frequency of ‘a’ males in the F1? Explain
C. What is the frequency of A- B- C- D- among the femals in the
F1? Explain
D. How many F2 genotypes will there be? Explain
E. What proportion of F2s will be heterozygous for the four
genes? Explain
F. How often will you obtain each of the following genotypes in
the F2: (1) A-bb CC dd (female); (2) aY BB Cc Dd; (3) AY bb cc dd;
(4) aa bb Cc Dd. Show rationale.
