Directions : In the following question more than one of the answers given may be correct. Select the correct answer and mark it according to the code:
Match List \[\text{I}\] with List \[\text{II}\] and select the correct answer using the codes.| \[\text{List}\,\text{-I}\] | \[\text{List}\,\text{-II}\] |
| 1. Complete Linkage | A. Genes remain together for at least 2 generations |
| 2. Incomplete linkage | B. Main cause is crossing over |
| 3. Isolalleles | C. Alleles expressing themselves within same phenotypic range |
| 4. Penetrance | D. Exchange between homologous parts of chromosomes during meiosis |
A) 1, 2 and 3 are correct
B) 1 and 2 are correct
C) 2 and 4 are correct
D) 1 and 3 are correct
Correct Answer: A
Solution :
Complete linkage is a phenomenon due to which genes remain together in the same chromosome for at least two generations. Incomplete or imperfect linkage refers to all those cases where genes remain together within the same chromosome for less than two genera is. The main cause of incomplete linksya is crossing over during meiosis. Isoaileles are the alleles expressing themselves within the same phenotypic range. During pachytene substage of prophase-I of meiosis, the non-sister chromatids of homologous chromosomes exchange segments between themselves. This is called crossing over, which results in the recombination.
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