Chromosomal Inheritance

AP Biology· difficulty 3/5

A genetic map shows four loci A, B, C, D arranged on a chromosome with map distances 9 mu (A-B), 8 mu (B-C), and 11 mu (C-D).

What is the predicted recombination frequency between loci A and D, assuming additivity?

A
$Approximately 28%$
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B
$Less than 1%$
C
$Approximately 11%$
D
$Exactly 50%$

Explanation

Map distances are additive over short intervals: 9 + 8 + 11 = 28 mu, corresponding to ~28% recombination. Distances above 50 cM saturate at 50%.

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