On the planet Krokus, flies are identical to earth flies in every way, except th

Question

On the planet Krokus, flies are identical to earth flies in every way, except they look like frogs with wings. The gene CLR, that codes for body color, has two alleles, G and g. G codes for purple body color, and g codes for green body color. A purple male Krokus fly mates with a female green Krokus fly, and they produce:

247 male purple flies;
252 female purple flies;
244 male green flies;
265 female green flies.

A second cross, using a male purple fly and a female purple fly from the F1 generation produces:

345 male purple flies;
332 female purple flies;
165 male green flies;
170 female green flies.

Based on these data, the most like mode of inheritance for body color with the Krokus flies is:

A. X-linked recessive.

B. Autosomal recessive, homozygous lethal.

C. Autosomal dominant, homozygous lethal.

D. Autosomal dominant.

E. Autosomal recessive.

Explanation / Answer

The answer to this question is autosomal dominant.

Summing up 2 generaions we get

1. 592 Purple males

2. 584 Purple females.

3. 409 Green males

4. 435 Green females

so in this case maximum no. of offsprings are of purple color. The allele of Purple color dominates the green color, hence unaffected by the presence of allele of green color in majority of cases. This is an example of autosomal Dominance

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