Fly 1: light red eyes, lots of bristles, stripes on the wings Fly 2: dark red ey

Question

Fly 1: light red eyes, lots of bristles, stripes on the wings

Fly 2: dark red eyes, lots of bristles, stripes on the wings

A more distantly related species has the following characteristics:

Distant relative: light red eyes, lots of bristles, no stripes on the wings

Q3. What are the most likely characteristics of the most recent common ancestor of Fly 1 and Fly 2?

lots of bristles; can't tell on other two traits
lots of bristles, stripes on the wings; can't tell on eye color
lots of bristles, stripes on the wings, dark red eyes
lots of bristles, stripes on the wings, light red eyes

Explanation / Answer

Ans. lots of bristles; stripes on the wings, can't tell on an eye color, since, which color (light red or dark red) is dominant is not known. If there is some crossing between fly 1 and fly 2, we can assume this trait in F1 generation. But such a description is not enclosed here. Recent ancestor would have a homozygous or heterozygous alleles for above traits that phenotypically express here. But with knowledge of eye color dominant alleles, It would be merely impossible to predict its ancestor eye color.

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