Question

b) State the expected ratio of the genotypes of BB and Bb in the F2 generation
Give the genotype for Round yellow and wrinkled yellow from the F2 generation of
dihybrid cross​

Answer 1

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10th

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Heredity and Evolution

Heredity

In the F_2 of dihybrid cr...

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Asked on December 27, 2019 by

Balwant Jaykumar

In the F

2

of dihybrid cross in pea plant the probability of yellow and round traits is

MEDIUM

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ANSWER

Dihybrid cross is a cross between two different lines/genes that differ in two observed traits. In the Mendelian sense, between the alleles of both these loci there is a relationship of complete dominance - recessive. In the example pictured to the right, RRYY/rryy parents result in F1 offspring that are heterozygous for both R and Y (RrYy).

Now the question demands the frequency of Round and yellow coloured seeds in F2 generation, which will be possible if the progeny have the genotype of R_Y_, where the blank spaces can be filled by either R or r. The probability of finding a R_ or Y_ genotype is 3/4. So the cumulative result will be (3/4) X (3/4).

So the correct option is '9/16'.