A-Level Biology Specification

AQA 7402

Section 7.1: Inheritance

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#7.1.1

The genotype is the genetic constitution of an organism.

#7.1.2

The phenotype is the expression of this genetic constitution and its interaction with the environment.

#7.1.3

There may be many alleles of a single gene.

#7.1.4

Alleles may be dominant, recessive or codominant.

#7.1.5

In a diploid organism, the alleles at a specific locus may be either homozygous or heterozygous.

#7.1.6

The use of fully labelled genetic diagrams to interpret, or predict, the results of:

- monohybrid and dihybrid crosses involving dominant, recessive and codominant alleles
- crosses involving sex-linkage, autosomal linkage, multiple alleles and epistasis.

#7.1.7

Use of the chi-squared (\(\chi^2\)) test to compare the goodness of fit of observed phenotypic ratios with expected ratios.