Chapter 3f - Nonallelic Interactions Flashcards
alternate form of a gene in which the alleles that affect a particular character are present at the SAME LOCUS of the gene
allelic gene
alternate form of a gene in which the alleles that affect a particular character are present at a DIFFERENT LOCI of the gene
non allelic gene
location of allelic gene
same location of the homologous chromosome
location of non allelic gene
different locations of the homologous chromosome
Two chromosomes in a pair – normally one inherited from the mother and one from the father
homologous chromosome
gene interaction types of allelic genes
- incomplete dominance
- lethal factor
- multiple alleles
gene interaction types of non allelic genes
- simple interaction
- complementary factor
- epistatis
- inhibitory factor
effects of non allelic gene
- could have no effect on phenotypes
- but cause inhibitory effect on other non-allelic genes
effects of allelic genes
could form lethal genes and cause death
Non-allelic interactions
- novel phenotype / simple interaction
- complementary gene action
- duplicate gene action
- recessive epistasis
- dominant epistasis
- dominant epistasis / inhibitory factor
- new phenotypes result from interaction between dominants
- also from interaction from homozygous recessives
novel phenotype / simple interaction
novel phenotype / simple interaction
9:3:3:1
- there is complete dominance of both gene paris
- either recessive homozygote is epistatic to the effects of the other gene
- need both dominant alleles to show
complementary gene action
complementary gene action
9:7
- there is complete dominance at both gene pairs, but either gene when dominant is epistatic to the other
- if either both or only one dominant is present
duplicate gene action
duplicate gene action
15:1
there is complete dominance at both gene pairs, but one gene when homozygous recessive, masks the effect of the other
recessive epistasis
recessive epistasis
9:3:4
there is complete dominance at both gene pairs, but one gene, when dominant masks the effect of the other
dominant epistasis
dominant epistasis
12:3:1
- there is complete dominance at both gene pairs, but one gene when dominant is epistatic to the second.
- the second gene, when HOMOZYGOUS RECESSIVE, is epistatic to the first
dominant epistasis / inhibitory gene action
dominant epistasis / inhibitory gene action
13:3
