Ijmb Model Questions Vol1 2020 Biology Question 10

Practice essay / theory question 10 from the 2020 Ijmb Model Questions Vol1 Biology examination. This question covers Genetic Linkage, Map Distance, Mendelian Genetics, Genetic Counselling .

Ijmb Model Questions Vol1 2020 Biology Essay / Theory
Topics: Genetic Linkage Map Distance Mendelian Genetics Genetic Counselling
Question 10 IJMB_MODEL_QUESTIONS_VOL1 • 2020 • BIOLOGY • essay

In a certain plant species, flower colour (P = purple, p = white) and seed shape (R = round, r = wrinkled) are controlled by two genes that are linked on the same chromosome. In a testcross, the following progeny were obtained from a heterozygous plant (PpRr) crossed with a homozygous recessive (pprr):\n\n400 purple‑round, 100 purple‑wrinkled, 90 white‑round, 410 white‑wrinkled.

Question Parts

( a )
Calculate the recombination frequency between the two genes and estimate their map distance in centiMorgans (cM).
( b )
Using the data, determine the most likely parental (non‑recombinant) gamete types produced by the heterozygous parent.
( c )
A couple, both carriers of an autosomal recessive disorder (genotype Aa), seek genetic counselling. Explain the probability that their first child will be affected, will be a carrier, and will be completely free of the mutant allele. Also discuss one prenatal diagnostic option.

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About This Question

This is Ijmb Model Questions Vol1 2020 Biology Question 10. It is one of the essay questions from the 2020 Ijmb Model Questions Vol1 Biology examination.

The question covers Genetic Linkage, Map Distance, Mendelian Genetics, Genetic Counselling .

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