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Summary Full AQA biology a level - genetics population evolution ecosystem unit 8 full notes
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,Inh!itance,Definitions
The complete genetic constitution of an organism.
The expression of an organism’s genetic constitution, combined with its interaction
with the environment.
, Alleles
Different forms of a particular gene, found at the same locus (position) on a chromosome. A single gene
could have many alleles.
2
An allele whose characteristic will always appear in the phenotype, whether one or two are present.
An allele whose characteristic only appears in the phenotype if no dominant allele is present, meaning two
must be present.
Two dominant alleles that both contribute to the phenotype, either by showing a blend of both
characteristics, or the characteristics appearing together.
Homozygous= both alleles are dominant, or both alleles are recessive.
Heterozygous= one allele is dominant, the other is recessive.
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