Feather Colour in Budgies Is Determined by Two Different Genes

Feather colour in budgies is determined by two different genes: Y for pigment on the outside of the feather, and B for pigment on 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 in the offspring is most possible?

A) green offspring only
B) white offspring only
C) blue offspring only
D) blue and white offspring

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