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Find out the % of plants, which are domi...

Find out the % of plants, which are dominant for both the character by the cross of `(,,)/(ab)` ab with it's recessive form, if 20% recombination is present:-

A

0.1

B

0.2

C

0.45

D

0.4

Text Solution

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The correct Answer is:
To solve the problem of finding the percentage of plants that are dominant for both characters in a cross of \(AB/ab\) with its recessive form, given that there is 20% recombination, we can follow these steps: ### Step 1: Understand the Cross We are crossing two plants: - One parent with the genotype \(AB\) (homozygous dominant) - The other parent with the genotype \(ab\) (homozygous recessive) ### Step 2: Determine the Gametes From the parent \(AB\), the gametes produced will be: - \(AB\) From the parent \(ab\), the gametes produced will be: - \(ab\) ### Step 3: Identify the Recombinant Gametes With 20% recombination, we can determine the percentage of recombinant gametes. The recombination results in: - 10% \(Ab\) (recombinant) - 10% \(aB\) (recombinant) ### Step 4: Calculate the Non-Recombinant Gametes Since the total recombination is 20%, the non-recombinant gametes will account for: - 80% of the offspring will be non-recombinant, which includes: - 40% \(AB\) (non-recombinant) - 40% \(ab\) (non-recombinant) ### Step 5: Determine the Percentage of Dominant Plants The dominant phenotype corresponds to the genotype \(AB\). Since we have calculated that 40% of the offspring will be \(AB\), this means that: - 40% of the plants will be dominant for both characters. ### Final Answer Thus, the percentage of plants that are dominant for both characters is **0.4** or **40%**. ---
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