DNA, genes and alleles, monohybrid crosses with Punnett squares, and variation and mutation.
Genetics explains how characteristics are inherited.
Key terms
- Gene: a length of DNA coding for a protein; allele: a version of a gene.
- Genotype: the alleles present; phenotype: the observable feature.
- Dominant alleles (capital) are shown even when heterozygous; recessive (lower-case) only when homozygous.
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