Biology A-Level

homozygous

What homozygous means in Biology A-Level, as defined for AQA.

Definition of homozygous

Check what you remember

Read the wording for your board, then hide it and explain homozygous in your own words. Rough notes are fine. This is a self-check, with no mark or grade.

Reference: AQA

Describes an organism with two identical alleles at a specific locus on homologous chromosomes.

AQA · Inheritance (A-level only) (study guide)

Topics that use homozygous

Inheritance (A-level only) (AQA A-Level)

Related terms

Using homozygous in the exam

Check the command word and mark scheme for your exact question. After comparing your explanation with the reference, use the term in an answer on the linked topic. This practice does not predict an exam mark.

Practise Biology questions

Create a free account to answer exam-style questions on this topic and get feedback on your answers.

Start free

A week of Premium from your first lesson · Then the free plan continues · No card, no charge

All Biology A-Level terms