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IB Biology HL D3.2 Inheritance Questions

Practise IB Biology HL D3.2 with inheritance diagrams and data questions on alleles, pedigrees, linkage, variation, probability and genetic disorders.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • interpret pedigrees and crosses to infer genotypes, phenotypes, allele dominance and inheritance probabilities
  • analyse linkage, recombination and chromosome data to explain departures from independent assortment
  • use genetic evidence to evaluate variation, mutation and inheritance patterns in populations

Covered syllabus points

D3.2.1—Haploid gametes + fusion = diploid zygoteD3.2.2—Genetic crosses in flowering plantsD3.2.3—GenotypeD3.2.4—PhenotypeD3.2.5—Dominant and recessive allelesD3.2.6—Phenotypic plasticityD3.2.7—Phenylketonuria (PKU)D3.2.8—SNPs and multiple allelesD3.2.9—ABO blood groupsD3.2.10—Incomplete dominance and codominanceD3.2.11—Sex determinationD3.2.12—HaemophiliaD3.2.13—Pedigree chartsD3.2.14—Continuous variationD3.2.15—Box-and-whisker plotsD3.2.16 (HL)—Segregation and independent assortmentD3.2.17 (HL)—Dihybrid crossesD3.2.18 (HL)—Human gene lociD3.2.19 (HL)—Autosomal gene linkageD3.2.20 (HL)—RecombinantsD3.2.21 (HL)—Chi-squared test

Learn this topic

Study D3.2 Inheritance conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

Question 1

[Maximum number: 1]

What is always passed to the next generation as a result of sexual reproduction?

A

Homologous chromosomes from the mother

B

A chromatid from every chromosome of the father

C

A haploid set of chromosomes from the mother

D

All alleles from each parent

Question 2

[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

Question 3

[Maximum number: 5]

In a strain of soybeans, high oil content (H) in seeds is dominant to low oil content (h) and four seeds in a pod (F) is dominant to two seeds in a pod (f). A farmer crosses two soybean plants, both with high oil content and four seeds in a pod. The offspring have a phenotypic ratio of 9: 3: 3: 1.

Question (a)

(a)

Identify the genotypes of the soybean plants with high oil content and four seeds in a pod that were used in the cross.

[ 1 ]

Question (b)

(b)

For the soybean cross HhFf × HhFf, determine the genotypes of the gametes and offspring using a Punnett grid.

[ 2 ]

Question (c)

(c)

Identify the phenotypes of each part of the phenotypic ratio.

Table for Question (c) — IB Biology HL
[ 2 ]
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