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Two linked genes a and b show 20% recomb...

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

A

`++80: ab 20`

B

`++50: ab50`

C

`++40 : ab40: +a10:+b10`

D

`++20:ab20:+20:+b20`

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The correct Answer is:
C
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