BIS 101 Chapter Notes - Chapter 5: Camoflauge, Epistasis, Heterokaryon
14 Nov 2016
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Document Summary
2 interacting genes produce modified dihybrid ratios. Gene interaction collaboration of several diff genes in production of one phenotypic character. Complementation production of wt phenotype when 2 different mutations combined in diploid or a heterokaryon. Important type of gene interaction is interaction between regulatory gene and gene that it regulates: common situation is regulatory gene that produces regulatory protein that binds to upstream regulatory site of target gene. Null mutation results in complete absence of function for gene. Mutations can cause stop codon to occur in middle of gene sequence. Epistasis situation in which differential phenotypic expression of genotypes @ one locus depends on genotype at another locus. Recessive epistasis case of recessive allele being epistatic. Epistasis inferred when allele of gene masks expression of alleles of another gene + expresses own phenotype. Suppressors also result in modified dihybrid ratios. Recessive suppressor acts on recessive mutation 13:3.
