In a plant two genes A/a and B/b are linked on the same chromosome with a recombination frequency of 10\%. One parent is heterozygous in cis configuration (AB/ab) and the other parent is homozygous recessive (ab/ab).

(a) Determine the expected phenotypic ratio among the progeny assuming A and B are dominant traits.
(b) What is the probability that a randomly selected offspring will have the recombinant genotype Ab (i.e., allele A together with allele b)?

Question

In a plant two genes A/a and B/b are linked on the same chromosome with a recombination frequency of 10\%. One parent is heterozygous in cis configuration (AB/ab) and the other parent is homozygous recessive (ab/ab).

(a) Determine the expected phenotypic ratio among the progeny assuming A and B are dominant traits.
(b) What is the probability that a randomly selected offspring will have the recombinant genotype Ab (i.e., allele A together with allele b)?

Accepted Answer

Phenotypic ratio 9:9:1:1; Probability of genotype Ab = 0.05 (5\%)

Neco Model Questions Vol1 2021 Biology Question 50

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