inheritance topic 7 Flashcards
(14 cards)
genotype
the genetic construction of an organsim
phenotype
the expression of genetics with environmental influences
homozygous
a pair of homologus chromosomes carrying two of the same alleles
heterozygous
a pair of homologus chromosomes carrying two different alleles
recessive allele
allele expressed if a dominant is not present
dominant allele
allele that is always expressed
codominant
two alleles that are equally dominant and code for one characteristic
multiple alleles
more than two alleles for a single gene
sex linkage
alleles expressed and carried on the X chromosome
autosomal linkage
genes located on the same chromosome
epistasis
when one gene modifies or masks the expression of another
What happens when a step in a biochemical pathway is disrupted due to lack of gene expression?
the phenotype lacks the final product in the pathway
when does recessive epistasis occur
when the epistatic gene is homozygous so it can block the hypostatic gene
when does dominant epistasis occur
when the epistatic gene is dominant and actively modifies or blocks the expression of the hypostatic gene
