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AP Bio: Unit 5

Genes

Allele A version of a gene. Each individual has two alleles for each gene, one from each parent.
Genotype The genetic makeup of an organism (ex: AA, Aa, aa).
Phenotype The observable traits of an organism (ex: purple flowers, white flowers, white with spots, etc.)
Homozygous Having two identical alleles for a gene (ex: AA or AA)
Heterozygous Having two different alleles for a gene (ex: Aa).
Dominant An allele that is expressed even if only one copy is present (represented by a capital letter,ex: A)
Recessive An allele that is only expressed if two copies are present (represented by a lowercase letter, ex: a)
Monohybrid Cross A cross that examines the inheritance of one trait.
Dihybrid Cross A cross that examines the inheritance of two traits at once.
Test Cross A cross with a homozygous recessive individual to determine the unknown genotype of another individual.
Created by: chianti
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