In Drosophila, white eye colour is recessive X-linked trait while red eye colour is dominant. A white eyed female is crossed with red eyed male. The female offspring with red eye colour would be.

100 %

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50 %

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25 %

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Zero

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Solution

The correct option is D $100 %$
1) The eye color gene is linked with to sex and is present on the X-chromosome. X-chromosome doesn't pass directly from father to the offsprings of the same sex but follows a criss-cross inheritance, which is transferred from one sex to the offspring of the opposite sex.
2) Since the trait of white eye color is recessive and linked to sex, it shows its effect in the male because of single X-chromosome. The female flies can show white-eye trait when both its X-chromosome carry the recessive allele of the white eye.
3) At last, Morgan concluded that only X chromosome carries the gene for eye color in Drosophila. Y-chromosome did not have the gene for eye color. The genes like the eye color present on the sex chromosome are said to be sex-linked or X-linked.

After crossing between white-eyed female (XWXW) with red-eyed male (X+Y), in the F1 generation, all the females flies were red-eyed and all the male flies were white-eyed. This result obtained is not the same as expected from the normal Mendelian ratio. This shows that the pattern of inheritance of eye color is dependent on X-chromosome. Therefore, it was concluded that the gene for eye color is located on the X-chromosome.

So, the correct answer is '100%'

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