Q.

What map unit (Centimorgan) is adopted in the construction of genetic maps?

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a

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

b

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

c

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

d

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

answer is D.

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Detailed Solution

Map unit is a number that corresponds to a recombination frequency of one percent.  It is unit of distance between genes on chromosomes, representing 1% cross over.

0.01 RF (Recombination frequency) = 1% RC (recombination) = 1 map unit distance = 1 centi- Morgan (cM). 

10 cM = 1 deci Morgan (dM). 

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