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IB Biology HL 2.5.2 Mendelian crosses and genotype analysis Question Bank

Practise IB Biology HL 2.5.2 by analysing parental genotypes and the outcomes of Mendelian crosses.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Deduce parental genotypes from offspring or phenotype evidence.
  • Analyse homozygous and heterozygous crosses to predict inherited traits.

D3.2.2—Genetic crosses in flowering plants question 1

[Maximum number: 1]

A pea plant that is homozygous for purple flowers is crossed with a pea plant having white flowers and the descendants are all plants with purple flowers. One of these F1\mathrm{F}_{1} plants is then crossed with a pea plant having white flowers. In the resulting offspring, what can be expected?

A

100 % of plants with purple flowers

B

100 % of plants with white flowers

C

75 % of plants with purple flowers, 25 % with white flowers

D

50 % of plants with purple flowers, 50 % with white flowers

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