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Significance of Crossing Over

Suppose a and...

Question

Suppose a and b gene shows incomplete linkage and shows $40 %$ recombination then find out the ratio of gamete in F generation by crossing ++/++ gene containing plant with ab/ab gene containing plant:

+ + 20 % : a b 20 % : + b 20 % : a + 40 %

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+ + 50 % : a b 50 %

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+ + 25 % : a b 25 % : b 25 % : a + 25 %

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+ + 30 % : a b 30 % : + b 20 % : a + 20 %

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Solution

The correct option is C $+ + 25 % : a b 25 % : b 25 % : a + 25 %$
Incomplete linkage is mainly caused due to segregation of chromosomes in F2 generation.
Sweet pea is an example of such recombination
It should be always less than parental one
In F2 generation it can be more

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20 %

+

+ / +

+

\times

a

b

30

+ + / + +

a b / a b

Two linked genes a and b show 30%recombination.The individual of a dihybrid cross ++/++ ab/ab shall produce gametes as:

1. ++80 : ab 20

2. ++40 : ab 40 : a10 : b 10

3. ++35 : ab 35 : a15 : +b15

4.++50: ab

Ans is (3)

Can I get the solution how to approach this questions

F_{1}

40 %

(a B)

A a B b

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