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

Two heterozygous pea plants (Tt) for tall (T) and short (t) height are crossed. Tall is dominant over short.

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]

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Paper 3Theory (Core)2 marks

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]