GENETICS AND EVOLUTION
GENETIC BASIS OF INHERITANCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of the following would best describe a Drosophila with the genotype XRXr, assuming XR = red eyes and Xr = white eyes?
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Female with red eyes
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A carrier female
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Male with red eyes
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A pure breed species
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Explanation:
Detailed explanation-1: -The eye color gene is located on the X chromosome (one of the sex determining chromosomes of Drosophila). White eye color is recessive. When a red eyed male mates with white eyed females, their daughters will have red eyes, but their sons will have white eyes.
Detailed explanation-2: -In Drosophila, white eye colour is recessive X-linked trait while red eye colour is dominant. A white eyed female is crossed with red eyed male.
Detailed explanation-3: -A ratio of copulation success is 0.75 for white-eyed male to 1 for wild-type male26.
Detailed explanation-4: -Since the red allele is a dominant allele, red-eyed flies would have one of these two genotypes: RR or Rr.
There is 1 question to complete.