In Drosophila, assume a dominant autosomal gene hairless (H) causes hairless fli

Question

In Drosophila, assume a dominant autosomal gene hairless (H) causes hairless flies. H/H is lethal. Another dominant, but sex-linked gene is a suppressor of hairless (Su-H). and reverses the effects of hairless when both are present in the heterozygous condition. so that the wild-type phenotype is what is observed in these flies. Su-H has no phenotypic effect by itself, but is lethal in the hemizygous and homozygous conditions. If females heterozygous for both H and Su-H are crossed to hairless males. What proportion of the male offspring will be viable? What proportion of the viable male offspring will be hairless? What proportion of the female offspring will be inviable? What proportion of the viable female offspring will be wild type in phenotype?

Explanation / Answer

YOU FIRST HAVE TO CREATE A PUNNET SQUARE WITH ALL THE DIFFERENT PHENOTYPES. AND THEN CALCULATE THE PERCENTAGE OF YOUR RESULTS. BASED ON WHAT WAS PROVIDED I THINK THE THE FOLLOWING IS CORRECT. BUT YOU MAYS STILL WANT TO DOUBLE CHECK.

XH YH (L): LETHAL

XH XXHH (L) XYHH (L)

Xh XXHh XYHh

X Su-H XXHSu-H (L) XYHSu-H(L)

Xh XXHh XYHh   

A) 50%

B)100%

C)50%

D)0%

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