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N5 MO4
Variation and Inheritance
14
Biology
Not Applicable
10/21/2017

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Term
variation
Definition
the differences between individuals in a species
Term
discrete
Definition
type of variation where individuals can be put into one of two or more groups
Term
continuous
Definition
type of variation where individuals fit somewhere on a scale between two extreme values
Term
single gene
Definition
type of variation controlled by alleles of one gene (discrete)
Term
polygenic
Definition
type of variation affected by more than one gene (continuous)
Term
gene
Definition
single unit of inheritance
Term
allele
Definition
one form of a particular gene
Term
genotype
Definition
the combination of alleles inherited
Term
phenotype
Definition
the effect of the genotype on the organism’s characteristics
Term
dominant
Definition
the alleles that can mask the effect of other alleles
Term
recessive
Definition
the alleles that can be masked by other alleles
Term
homozygous
Definition
genotype with both alleles the same (e.g. HH or hh)
Term
heterozygous
Definition
genotype with two different alleles (e.g. Hh)
Term
fertilisation is a random process
Definition
the reason why predicted ratios and actual ratios of offspring in genetic crosses are rarely the same
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