Feather Color in Budgies Is Determined by Two Different Genes

question 36

Multiple Choice

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 only
• B) yellow offspring only
• C) blue offspring only
• D) green and yellow offspring
• E) a 9:3:3:1 ratio

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