Feather Colour in Budgies Is Determined by Two Different Genes

question 5

Multiple Choice

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. Two blue budgies were crossed. Over the years, they produced 22 offspring, five 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

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Definitions:

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