Feather color in budgies is determined by two different genes, Y and B, one for 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.
A blue budgie is crossed with a white budgie. Which of the following results is not possible?
A) green offspring onlyB) yellow offspring only
C) blue offspring only
D) green and yellow offspring
E) a 9:3:3:1 ratio
Answer: D
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 yyBBB) yyBB and yyBb
C) yyBb and yyBb
D) yyBB and yybb
E) yyBb and yybb
Answer: C
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