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the extent to which an allele is expressed in an individual
expressivity
model organism used by Mendel in breeding experiments
garden pea
father of genetics
Mendel
both alleles are expressed in heterozygotes
codominance
allele which, if present, will be expressed
dominant
Who did breeding experiments with fruit flies
Morgan
having different alleles for a trait
heterozygous
genetic disease due to lack of an enzyme needed to metabolize phenylalanine
PKU
transmission of traits from parent to offspring
heredity
more than 2 alleles for a gene
multiple allelism
likelihood that an event will occur
probability
when two genes are located on the same chromosome
gene linkage
phenotype of heterozygote is intermediate between homozygous dominant and homozygous recessive phenotypes
incomplete dominance
observable features of an organism; physical expression of genotype
phenotype
one gene effects more than one trait
pleiotropy
type of inheritance where many genes contribute to the expression of a single trait
polygenic
indicates alleles an individual has for a particular trait
genotype
when one gene affects the expression of another gene
epistasis
having 2 copies of the same allele for a trait
homozygous
allele which is only expressed in the homozygous condition
recessive
genetic cross which follows two traits simultaneously
dihybrid
genetic cross following just one trait
monohybrid
refers to presence of a gene on a sex chromosome
sex linkage
x of y cards