Igcse Model Questions Vol1 2018 Biology Question 10

Practice essay / theory question 10 from the 2018 Igcse Model Questions Vol1 Biology examination. This question covers Mendelian inheritance, Pedigree analysis, Autosomal recessive disorders, DNA replication fidelity .

Igcse Model Questions Vol1 2018 Biology Essay / Theory
Topics: Mendelian inheritance Pedigree analysis Autosomal recessive disorders DNA replication fidelity
Question 10 IGCSE_MODEL_QUESTIONS_VOL1 • 2018 • BIOLOGY • essay

Answer the following questions about genetics.

Question Parts

( a )
A pure‑breeding tall pea plant (TT) is crossed with a pure‑breeding short plant (tt). All F1 plants are tall and are self‑fertilised to produce the F2 generation.
( ) Predict the genotypic ratio among the F2 offspring.
( ) Predict the phenotypic ratio among the F2 offspring.
( ) Calculate the probability that a randomly selected F2 plant is tall.
( b )
In a family a disorder is known to be autosomal recessive. The affected individual (II‑2) has unaffected parents (I‑1 and I‑2). His unaffected sister (II‑1) marries an unaffected man (II‑3). They have a child (III‑1) who is affected. Determine the genotype of II‑1 and the probability that a future child of II‑1 and II‑3 will be affected.

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About This Question

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

The question covers Mendelian inheritance, Pedigree analysis, Autosomal recessive disorders, DNA replication fidelity .

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