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GCSE Combined Science · key term
Having two different alleles of a particular gene.
Used by AQA and Edexcel
Specification 4.6.1.4 · Paper 2
Revise: Genetic InheritanceHomozygous means having two identical alleles of a gene; heterozygous means having two different alleles. Both TT and Tt plants are tall, although their genotypes differ. A Tt plant still carries the recessive allele and can pass it to an offspring.
Paper 1, Paper 2
Having two different alleles of a particular gene, such as .
A dominant phenotype does not uniquely identify a genotype: the individual could be homozygous dominant or heterozygous.
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Four offspring from two heterozygous parents need not include exactly one short plant. Larger numbers of offspring are more likely to show proportions close to the predicted ratio.