Reproduction: Alleles 🧬 GCSE Biology Learning & Revision
In this episode, we will discuss alleles.
Alleles, different forms of genes, determine individual characteristics. Humans inherit pairs of alleles for each gene, with these alleles being either dominant or recessive.
Dominant alleles express their trait even when paired with a recessive allele, requiring only one copy to be present.
Conversely, recessive alleles only manifest their trait when paired with another identical recessive allele, needing two copies for expression.
We can illustrate this concept by using the example of eye colour, with the 'B' allele representing dominant brown eyes and the 'b' allele representing recessive blue eyes. Thus, genotypes (BB, Bb, bb) determine visible traits.
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