AP BIOLOGY

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HEREDITY

LINKED GENES

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
There is 30% recombination frequency between two genes. The distance between them in unit map is:
A
15
B
30
C
60
D
80
Explanation: 

Detailed explanation-1: -Therefore, 15cM will be the distance between the genes.

Detailed explanation-2: -In contemporary high-density marker data, the probability of multiple crossovers between adjacent loci is negligible and different mapping functions yield the same result, that is, the recombination frequency between adjacent loci is equal to the map distance in Morgans.

Detailed explanation-3: -The # of recombinant offspring / total # of offspring x 100% = recombination frequency. Recombination frequency = map units = centiMorgan (cM)

Detailed explanation-4: -For any two genes (or loci) alpha and beta, we can ask “What is the recombination frequency between them?” If the genes are on different chromosomes, the answer is 50% (independent assortment). If the two genes are on the same chromosome, the recombination frequency will be somewhere in the range from 0 to 50%.

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