Cambridge IGCSE Biology practice

Paper 3 structured question: Monohybrid inheritance

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Paper

Marks

Topic

Monohybrid inheritance

Exam-style question

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Paper 3Theory (Core)2 marks

A pea plant with yellow seeds (Yy) is crossed with a pea plant with green seeds (yy). Yellow seed color is dominant over green.

Description

Cross between a heterozygous yellow seed plant (Yy) and a homozygous green seed plant (yy).

Parent 1 alleles	Parent 2 alleles
Y	y
y	y

a
Identify the genotypes of the offspring from this cross.
Your answer
Aim for approximately 2 distinct marking points.
[2]

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Paper 3Theory (Core)2 marks

Description

Cross between two heterozygous tall pea plants (Tt × Tt).

Parent 1 alleles	Parent 2 alleles
T	t
T	t

a
Calculate the phenotypic ratio of the offspring.
Your answer
Aim for approximately 2 distinct marking points.
[2]