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31 December, 18:37

In Nitrovian flyti, with biological systems identical to those of earth fruit flies, there is a phenotype, Tofutti, in which the flyti are strictly vegetarian. If a true-breeding female (non-vegetarian) is mated with a vegetarian male, they produce 1000 F1 offspring in the following counts: 523 non-vegetarian female flyti; 477 non-vegetarian male flyti. In a reciprocal cross, the numbers of F1 offspring produced are: 502 non-vegetarian female flyti; 498 vegetarian male flyti. The most likely explanation for these results is:

A. The gene coding for Tofutti is X-linked dominant.

B. The gene coding for Tofutti is autosomal dominant and homozygous lethal.

C. The gene coding for Tofutti is X-linked recessive.

D. There is insufficient information to answer this question.

E. The gene coding for Tofutti is autosomal recessive and homozygous lethal.

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  1. 31 December, 18:41
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    C. The gene coding for Tofutti is X-linked recessive.

    Explanation:

    In first cross:

    non vegetarian female X vegetarian male = The entire progeny is non vegetarian.

    In second cross:

    vegetarian female X non vegetarian male = all females are non vegetarian and all males are vegetarian

    If the gene for this trait is X-linked recessive then the above results can be explained as follows:

    First cross : XTXT X XtY:

    XT XT

    Xt XTXt XTXt

    Y XTY XTY

    All males have dominant XT allele so they all will be non vegetarian. All females are heterozygous so they will also be non vegetarian.

    Second cross : XtXt X XTY:

    Xt Xt

    XT XTXt XTXt

    Y XtY XtY

    All males have recessive Xt allele so they all will be vegetarian. All females have one dominant XT allele so they all will be non vegetarian.
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