1. Tardigrade
  2. Question
  3. Biology
  4. In Drosophila cross, the heterozygous member with grey body (b+) and long wings (vg+) was crossed with black body and vestigial wings, the progeny had the following ratio; grey vestigial 24: grey long 126: black long 26: black vestigial 124. What is the frequency of recombinants in the population?

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Q. In Drosophila cross, the heterozygous member with grey body (b+) and long wings (vg+) was crossed with black body and vestigial wings, the progeny had the following ratio; grey vestigial 24: grey long 126: black long 26: black vestigial 124. What is the frequency of recombinants in the population?

NTA AbhyasNTA Abhyas 2022

Solution:

P1 = grey and long
P2 = black and vestigial
Their recombination results in grey vestigial and black long variants.
Total population: 300
Recombinant population (26 grey vestigial + 24 black long): 50
$FrequencyofRecombination=\frac{Total number of recombinants x 100}{Total number of individuals \left(\right. population \left.\right)}Therefore,wehaveFrequencyofRecombination=\frac{50 \left(\right. total recombinants \left.\right) x 100}{300 \left(\right. total of population \left.\right)}$
Frequency of recombinants in the population: 50/300 × 100 = 16.7 %