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Define Linkage. |
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Answer» Linkage: The genes located on same chromosome remain linked together in passing from one generation to other generation due to the phenomenon of linkage. Example: Morgan conducted several dihybrid crosses in Drosophilla and observed that the two genes located on the same chromosome did not segregate independently of each other and F2 ratio deviated very significantly from the 9:3:3:1. A cross between yellow body white eyed female Drososphilla to brown body red eyed male resulted following ratio. Parental Type – 97.7% Recombinant type – 1.3% The greater percentage of parental type is due to the phenomenon of Linkage. |
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