Question

Two genes A and B present on same chromosome show 40% crossing over value then what will be percentage of gamete (ab) for the plant having genotype AaBb (cis arrangement)
a)40%
b)20%
c)80%
d)10%

Answer 1

The correct answer is 20%

Chromosomal crossover is the exchange of genetic material between 2 homologous chromosomes non-sister chromatids that results in recombinant chromosomes during sexual reproduction. Crossing over of genes is a big factor in the genetic diversity of living things.

Answer 2

Two genes A and B present on same chromosome show 40% crossing over value then what will be percentage of gamete (ab) for the plant having genotype AaBb  - 20%

Explanation:

• There is just 40% crossing over between genes A and B on same chromosome which means the probability is $\frac{40}{100}$ or 0.4. If the plant has genotype AaBb in cis arrangement, then it will have four types of gamete as AB, Ab, aB and ab.
• here, aB will be considered as recombinant gamete of the plant having genotype AaBb in cis arrangement and hence, the probability of occurrence of aB is just the half. , meaning, 50% or the probability as 0.5. Hence, the percentage of gamete aB formed is 0.5 x 0.4 = 0.2 or 20%.
• Hence, the correct answer is '20%'.

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