Principle of Inheritance and VariationHard

Question

Two linked genes a and b show 20 % recombination. The individuals of a dihybrid cross between + + / + + × ab / ab shall show gametes

Options

A.+ + 80     :     ab : 20
B.+ + 50     :     ab
C.+ + 40     :     ab 40 : + a 10 : + b : 10
D.+ + 30     :     ab 30 : + a 20 : + b : 20

Solution

The gametes of a dihybrid cross between + + / + + × ab / ab will be : + + 40 : ab40 : + a 10 : + b : 10

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