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Standard XII

Biology

Definition of Linkage and Linked Genes

A heterozygou...

Question

A heterozygous red-eyed female Drosophila mated with a white-eyed male would produce

Red-eyed females and white-eyed males in the

F_{1}

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White-eyed females and red-eyed males in the

F_{1}

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Half red and half white-eyed females and all white eyed males in the

F_{1}

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Half red and half white-eyed females as well as males in the

F_{1}

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Solution

The correct option is D Half red and half white-eyed females as well as males in the $F_{1}$
The eye colour in Drosophila is sex linked and allele is present on X chromosome. Thus a red eyed heterozygous female (XR Xr) will produce two types of gametes XR and Xr while the white eyed male (Xr Y) will produce two gametes ie Xr and Y. The R allele codes for red eye colour and r allele codes for white eye colour. Y chromosome does not has any allele for eye colour and R is dominant over r.
Possible combinations of these four gamete types are
XR Xr ie Red eye female,
XR Y ie Red eye male,
Xr Xr ie white eye female,
Xr Y ie white eye male.

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Similar questions

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Q. When a white eye Drosophila male

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, in the

F_{2}

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males are white eyed. In a criss cross test, when a white eyed female

(X^{r} X^{r})

is crossed to a red eye male

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, the

F_{1}

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(X^{r} X^{r})

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, white eye female

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