Question

Two genes A and B present on same chromosome show $40\%$ recombination, then what will be the percentage of gamete $\left(aB\right)$ for the plant having genotype $AaBb$ in cis arrangement?

• A. $40\%$
• B. $70\%$
• C. $20\%$
• D. $15\%$

Answer 1

The correct option is C $20\%$

Genotype of plant $=AaBb$

Number and types of gametes
$=(2{)}^n=(2{)}^2=4$
AB, Ab, aB, ab. (Ab and aB are recombinant gametes).

Since, recombination $=40\%$
Hence, $aB$ will be $=20\%$
$Ab$ will be $=20\%$