A) Independent assortment of genes
B) Crossing over
C) Linkage
D) Mutation
Correct Answer: C
Solution :
[c] Linkage will not result in variations among siblings. Morgan carried out several dihybri crosses in Drosophila to study genes that were sex-linked. Morgan came to know that the genes were located on the X-chromosome and also observed that when the two genes in a dihybrid cross were situated on the same chromosome, the proportion of parental gene combinations were much higher than the non-parental type. It indicates that due to the physical association of the two genes, there will be no variations among siblings.
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