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

Genetics and inheritance

Description

An organism has two alleles for a gene: one allele codes for brown eyes and the other codes for blue eyes.

a
Describe what is meant by heterozygous in this example?
Your answer
Aim for approximately 2 distinct marking points.
[2]

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Paper 3Theory (Core)1 marks

Description

An organism inherits two alleles for each gene, one from each parent. Sometimes these alleles are different.

a
State what is meant by heterozygous?
Your answer
Aim for approximately 1 distinct marking point.
[1]