Ijmb Model Questions Vol1 2022 Biology Question 10

Practice essay / theory question 10 from the 2022 Ijmb Model Questions Vol1 Biology examination. This question covers Genetics .

Ijmb Model Questions Vol1 2022 Biology Essay / Theory
Topic: Genetics
Question 10 IJMB_MODEL_QUESTIONS_VOL1 • 2022 • BIOLOGY • essay

In a population of a certain plant species, flower colour is determined by a single gene with two alleles: R (red) is dominant to r (white). A random sample of 200 plants shows 120 red and 80 white individuals.

Question Parts

( a )
Estimate the allele frequencies of R and r in the population assuming Hardy‑Weinberg equilibrium. Show all calculations.
( b )
Using the estimated allele frequencies, calculate the expected numbers of each genotype (RR, Rr, rr) in the sample and compare them with the observed phenotypic numbers. Discuss any deviation from Hardy‑Weinberg equilibrium.
( c )
A breeder crosses two heterozygous (Rr) plants. (i) Construct a Punnett square and state the probability that an offspring will have white flowers and be homozygous recessive. (ii) If 500 seeds are produced, estimate how many white‑flowered, homozygous recessive seedlings are expected.
( d )
A molecular marker gene (A) is linked to the R locus at a recombination frequency of 10 cM. Explain how this recombination frequency influences the segregation of the two traits in a test cross, and calculate the expected proportion of recombinant offspring.

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About This Question

This is Ijmb Model Questions Vol1 2022 Biology Question 10. It is one of the essay questions from the 2022 Ijmb Model Questions Vol1 Biology examination.

The question covers Genetics .

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