Ijmb Model Questions Vol1 2019 Biology Question 10

Practice essay / theory question 10 from the 2019 Ijmb Model Questions Vol1 Biology examination. This question covers Mendelian Genetics, Autosomal Recessive Inheritance, Genetic Counseling .

Ijmb Model Questions Vol1 2019 Biology Essay / Theory

Topics: Mendelian Genetics Autosomal Recessive Inheritance Genetic Counseling

Question 10 IJMB_MODEL_QUESTIONS_VOL1 • 2019 • BIOLOGY • essay

In a remote community a rare autosomal recessive disorder (designated disorder X) has a carrier frequency of 1 in 25. A man affected by disorder X (homozygous recessive) wishes to marry a woman from the same community whose carrier status is unknown.

Question Parts

( a )

Calculate the probability that their first child will be affected by disorder X.

( b )

If the couple have three children, what is the probability that exactly one of them will be affected?

( c )

Explain the molecular basis of disorder X, describing how a mutation in the responsible gene leads to the observed clinical features.

( d )

Propose a concise genetic counselling plan for the couple, covering risk communication, reproductive options and any recommended investigations.

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About This Question

This is Ijmb Model Questions Vol1 2019 Biology Question 10. It is one of the essay questions from the 2019 Ijmb Model Questions Vol1 Biology examination.

The question covers Mendelian Genetics, Autosomal Recessive Inheritance, Genetic Counseling .

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