BIO 115 Lecture Notes - Lecture 25: Epistasis, Dihybrid Cross, Byron Bay Film Festival
21 Mar 2018
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Document Summary
Non-mendelian genetics: hemophilia a. gene for clotting factor a is on the x-chromosome. Hemophilia is a sex linked disease (or genes that rest on either the x or y chromosome) b. Inheritance a. proteins functioning in cells produce traits b. Sometimes only a small amount of protein is enough. Dominant or recessive traits: these are all special single gene situations: More than 2 alleles in a population (ex: ia, ib, and i) Both alleles completely show at the same time. Loss of 1 function leads to multiple problems. Individuals with same genotype exhibit different phenotype depending on conditions. Alleles of 1 gene impacts the phenotype of another gene. Without the f the color will not be there . because of epistasis! Usually high variations in phenotypes: linked genes. When genes are on the same chromosome, they are sometimes inherited as a set. There is a higher percentage of offspring that look like parents than independent assortment.
