In a type of parakeet known as a budgie feather color is co

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.

Solution

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