lecture 13 Flashcards
gene interactions pt. 1
what is a type of gene interaction with more than one gene, but only one trait; two or more different gene products acting together to modify a phenotype?
epistasis
how many alleles are involved in epistatic traits at each locus?
only two
what type of effect is present in epistatic interactions?
inhibitory effect caused by a recessive alleles not allowing the gene to function properly
what ratio changes for the different kinds of epistasis?
phenotypic ratio
what is the genotypic ratio for all kinds of epistasis?
1:2:1:2:4:2:1:2:1
in recessive epistasis, what determines the phenotype?
homozygous recessive genotype
what type of epistasis is present in labs?
recessive epistasis
what is the phenotypic ratio for recessive epistasis?
9:3:4
what is the base cross for understanding ALL EPISTATIC problems?
dihybrid heterozygote cross
