Ijmb Model Questions Vol1 2018 Biology Question 10

Practice essay / theory question 10 from the 2018 Ijmb Model Questions Vol1 Biology examination. This question covers Genetics .

Ijmb Model Questions Vol1 2018 Biology Essay / Theory
Topic: Genetics
Question 10 IJMB_MODEL_QUESTIONS_VOL1 • 2018 • BIOLOGY • essay

Answer the following questions on genetics.

Question Parts

( a )
A farmer crosses two true‑breeding pea plants, one with purple flowers (PP) and one with white flowers (pp). The F1 generation is self‑pollinated to produce an F2 generation. Calculate the expected phenotypic ratio and the probability that a randomly selected F2 plant will be heterozygous (Pp).
( b )
In a dihybrid cross involving genes A/a (seed shape) and B/b (seed colour), the parental genotypes are AaBb × AaBb. Assuming independent assortment, determine the genotypic ratio for the offspring that are homozygous recessive for both traits.
( c )
A pedigree shows a rare autosomal recessive disorder. Explain how you can determine whether the disorder is autosomal recessive or dominant from the pedigree, and describe the implications for recurrence risk in the offspring of two carrier parents.

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About This Question

This is Ijmb Model Questions Vol1 2018 Biology Question 10. It is one of the essay questions from the 2018 Ijmb Model Questions Vol1 Biology examination.

The question covers Genetics .

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