BiologyAQA (7402) / Edexcel (9BN0)Genetics

Genetics & Inheritance Interactive Guide

AQA / Edexcel A-Level Biology

Genetics and inheritance questions appear on every A-Level Biology paper. This interactive guide lets you set up and solve genetic crosses using Punnett squares — covering monohybrid inheritance, dihybrid crosses, codominance, incomplete dominance, multiple alleles, sex-linked inheritance, and epistasis. Each cross shows expected phenotypic and genotypic ratios with step-by-step workings. Aligned to AQA and Edexcel specification requirements for genetic diagram construction and interpretation.

Uses Google Fonts (Literata, Nunito Sans). Requires an internet connection for full styling.

Frequently asked questions

What is a monohybrid cross?+

A monohybrid cross examines the inheritance of a single gene with two alleles. A cross between two heterozygous parents (Aa × Aa) produces a 3:1 phenotypic ratio in the offspring — three showing the dominant phenotype and one showing the recessive phenotype.

How do you construct a Punnett square?+

Write the gametes of one parent across the top and the other down the side. Fill in each cell with the combination of alleles from the corresponding row and column. Count the resulting genotypes and phenotypes to determine ratios.

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