Alleles (Edexcel GCSE Biology): Flashcards
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Definition of alleles
Definition of alleles
Different versions of the same gene
Number of alleles per gene in each individual
Number of alleles per gene in each individual
Two (one from each parent)
How alleles are represented in genetic diagrams
How alleles are represented in genetic diagrams
By letters
Term when both alleles are the same
Term when both alleles are the same
Homozygous
Term when two alleles are different
Term when two alleles are different
Heterozygous
Definition of genotype
Definition of genotype
Combination of alleles an individual has
Definition of phenotype
Definition of phenotype
Physical expression of the trait
Characteristic of a dominant allele
Characteristic of a dominant allele
Always expressed, even if only one copy present
How dominant alleles are represented
How dominant alleles are represented
Capital letter (e.g., A)
Characteristic of a recessive allele
Characteristic of a recessive allele
Only expressed if two copies present
How recessive alleles are represented
How recessive alleles are represented
Lowercase letter (e.g., a)
Genotypes showing dominant characteristic
Genotypes showing dominant characteristic
Two dominant (CC) or one of each (Cc)
Genotype showing recessive characteristic
Genotype showing recessive characteristic
Two recessive alleles (cc)
What happens in genotype Cc
What happens in genotype Cc
Dominant allele overrules the recessive
How most traits are determined
How most traits are determined
Interaction of multiple genes