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The Father has red eyes. The Mother has purple eyes. All daughters have red eyes. All...

Question

The Father has red eyes. The Mother has purple eyes. All daughters have red eyes. All...
The Father has red eyes.
The Mother has purple eyes.

All daughters have red eyes.
All sons have purple eyes.

Is this consistent with a trait being determined by an X linked recessive case? why or why not?

Answers

Let allele for red eye X' and allele for purple eye X

Genotype of father is X'Y = red eye

Genotype of mother XX = Purple eye

Possible Genotype of daughter X'X = red eye

Possible genotype of son XY = purple eye

Here, on crossing Y chromosome of father and X chromosome of mother always goes to son . Hence, all son will have purple eye.

On crossing X' chromosome of father and X chromosome of mother always go to daughter. Hence, all daughter will have red eye.

This show that it is not X linked recessive case.

But it is X linked dominant case.


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