AP BIOLOGY

HEREDITY

LINKAGE MAPPING

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
How many genes can be mapped with the help of a double crossover?
A
3
B
2
C
4
D
either 2 or 3
Explanation: 

Detailed explanation-1: -A particularly efficient method of mapping three genes at once is the three-point cross, which allows the order and distance between three potentially linked genes to be determined in a single cross experiment (Figure 7.7. 12).

Detailed explanation-2: -A two-factor cross can tell us about the distance between two genes, but cannot tell us anything about the order of the two genes. In contrast, a three-factor cross study focuses on three linked genes and can tell us about the order of the three genes on their chromosome and the distances between each pair of genes.

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