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Sex linked inheritance was discovered by
Sex linked inheritance was discovered by
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Solution
The correct option is D Morgan
T.H. Morgan discovered sex-linkage in Drosophila melanogaster. He noted the sudden appearance of one white-eyed male (mutant form) in the culture of normal red-eyed Drosophila. This white-eyed male was crossed with red eyed female. The F1 flies (both male and female) were all red-eyed indicating that white eye colour is recessive to the normal red eye colour. When these F1 flies were inter-crossed freely, the red and white-eyed flies appeared in the ratio 3: 1 in the F2 generation. White-eyed flies were male. Among the red eyed flies, two-third were female and one-third were male. The females were all red-eyed whereas 50% males were white-eyed and the remaining 50% males were red-eyed. If a reciprocal cross is performed between white-eyed female and red-eyed male individual, all female individuals in F1 generation are red-eyed and all male individuals, are white-eyed. When these two types of individuals from F1 generation are intercrossed, female population in F2 generation will consist of 50% red-eyed and 50% white-eyed individuals. Similarly, the male population in this generation consists of 50% red-eyed and 50% white-eyed individuals. Thus, option C is correct and other options are wrong.
T.H. Morgan discovered sex-linkage in Drosophila melanogaster. He noted the sudden appearance of one white-eyed male (mutant form) in the culture of normal red-eyed Drosophila. This white-eyed male was crossed with red eyed female. The F1 flies (both male and female) were all red-eyed indicating that white eye colour is recessive to the normal red eye colour. When these F1 flies were inter-crossed freely, the red and white-eyed flies appeared in the ratio 3: 1 in the F2 generation. White-eyed flies were male. Among the red eyed flies, two-third were female and one-third were male. The females were all red-eyed whereas 50% males were white-eyed and the remaining 50% males were red-eyed. If a reciprocal cross is performed between white-eyed female and red-eyed male individual, all female individuals in F1 generation are red-eyed and all male individuals, are white-eyed. When these two types of individuals from F1 generation are intercrossed, female population in F2 generation will consist of 50% red-eyed and 50% white-eyed individuals. Similarly, the male population in this generation consists of 50% red-eyed and 50% white-eyed individuals. Thus, option C is correct and other options are wrong.
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