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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
- CSIR NET
- Life Sciences
In an organism, allele for red eye colour is dominant over the allele for white eye colour. A cross is made between a white eyed male and a red eyed female. In the progeny all males are red eyed while the females are white eyed. The reciprocal cross leads to all red eyed progeny. Based on the above information which one of the following conclusions is correct ?
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Eduncle Best Answer
It is a sex-linked trait because the trait is not limited to just one gender, but is expressed in both the genders depending upon the genotype of the male and the female parents. In the first cross, the male genotype is ZrZr and the female genotype is ZRW, therefore the offsprings are ZRZR (male:red) and ZrW (female: white). In the reciprocal cross, the male parent was ZRZR and the female was ZrW, so the offsprings were all red, ZRZr (male:red) and ZRW (female: red). Here the male is having homomorphic sex (Homomorphic chromosomes :Morphologically identical members of a homologous pair of chromosomes. Heteromorphic chromosomes :A chromosome pair with some homology but differing in size, shape, or staining properties).