NEET Solved Paper 2019 Question 83

Question: What map unit (Centimorgan) is adopted in the construction of genetic maps? [NEET 5-5-2019]

Options:

A) A unit of distance between genes on chromosomes, representing 1% cross over.

B) A unit of distance between genes on chromosomes, representing 50% cross over.

C) A unit of distance between two expressed genes, representing 10% cross over.

D) A unit of distance between two expressed genes, representing 100% cross over.

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Answer:

Correct Answer: A

Solution:

A centimorgan (cM) is a unit of measure for genetic linkage. It represents the distance between chromosome positions (or loci) for which the expected average number of intervening chromosomal crossovers in a single generation is 0.01, or 1%.