In a type of parakeet known as a \"budgie, \" feather color is controlled by two

Question

In a type of parakeet known as a "budgie, " feather color is controlled by two genes. A yellow pigment is synthesized under the control of a dominant allele Y. Budgies that are homozygo for the recessive y allele do not synthesize yellow pigment. At an independently assorting gene, the dominant allele B directs synthesis of a blue pigment. Recessive homozygotes with bb genotype do not produce blue pigment. Budgies that produce both yellow and blue pigments have green feathers; those that produce only yellow pigment or only blue pigment have yellow or blue feathers, respectively; and budgies that produce neither pigment are white (albino). Determine the possible genotypes for green, yellow, blue, and albino budgies. Drag the appropriate items to their respective bins.

Explanation / Answer

We have to understand here that allele Y produces yellow pigment and its recessive allele y do not produce yellow pigment. Therefore parakeets with yellow feathers will have genotype;

YYbb or Yybb.

In the same way allele B produces blue pigment and its recessive allele does not produce blue pigment. So parakeets with blue feathers will have genotype ;

yyBB or yyBb.

Parakeets that produce both yellow and blue pigment have green colour. Their genotype can be;

YYBB, YYBb, YyBB, YyBb

Parakeets that produce no pigment have white colour, therefore their genotype can be written as;

yybb.

Therefore genotypes can be written as;

Blue:

yyBB, yyBb.

Yellow;

YYbb, Yybb

Green;

YYBB, YYBb, YyBB, YyBb

Albino;

yybb

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