Chapter 14: Mendel and the Gene Idea

Last update by Jianan on 04/11/2013
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Feather color in budgies is determined by two different genes Y and B, one pigment on the outside and one for the inside of the feather. YYBB, YyBB, or YYBb is green; yyBB or yyBb is blue; YYbb or Yybb is yellow; and yybb is white.

Two blue budgies were crossed. Over the years, they produced 22 offspring, 5 of which were white. What are the most likely genotypes for the two blue budgies?
a. yyBB and yyBB
b. yyBB and yyBb
c. yyBb and yyBb
d. yyBB and yybb
e. yyBb and yybb

Answer:
C: yyBb and yyBb

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