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IB Biology HL D3.2.2 Genetic Crosses in Flowering Plants Questions

Analyse flowering-plant genetic crosses by identifying parental genotypes and tracing the predicted inherited outcome in IB Biology HL D3.2.2.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Construct and interpret a flowering-plant Punnett grid across parental, F1 and F2 generations, showing gametes, offspring genotypes, phenotypes and expected ratios.
  • Identify the parental genotype combination in a plant cross before predicting the inherited outcome.

IB Biology HL D3.2.2 Genetic Crosses in Flowering Plants Questions 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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