Two red-eyed, long-winged fruit flies were bred together andproduced the followi

Question

Two red-eyed, long-winged fruit flies were bred together andproduced the following offspring: females: 3/4 red eyed and long winged, 1/4red eyed and vestigial winged males: 3/8 red eyed and long winged, 3/8white eyed and long winged, 1/8 red eyed and vestigial winged, and1/8 white eyed and vestigial winged.
Consider that you have a ratio of phenotypes on the females that is different from themales- what does that usuallymean? Two red-eyed, long-winged fruit flies were bred together andproduced the following offspring: females: 3/4 red eyed and long winged, 1/4red eyed and vestigial winged males: 3/8 red eyed and long winged, 3/8white eyed and long winged, 1/8 red eyed and vestigial winged, and1/8 white eyed and vestigial winged.
Consider that you have a ratio of phenotypes on the females that is different from themales- what does that usuallymean?

Explanation / Answer

Yes, it is the white eyes. You know that the eyes are X-linkedrecessive because males are more likely to receive this type ofphenotype because they only have one X chromosome and thereforeonly need to receive the recessive gene once in order to have it.Females, however, have two X chromosomes and would need to receivethe trait from both parents in order to have it.

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