[BI226] - Midterm Exam Guide - Everything you need to know! (30 pages long)
Document Summary
Some phenotypic variation poses a challenge to mendelian analysis. Treasure your exceptions they tell there is more to come and where the next construction is to be-william bateson. Crosses of pure-breeding lines can result in progeny phenotypes that don"t appear to follow mendel"s rules. A gene may have >2 alleles (multiple alleles0. Pleiotropy- one gene may contribute to several characteristics a. b. The phenotype of the heterozygote defines the dominance relationship of two alleles. Complete dominance: hybrid resembles one of the two parents. Flower color in snapdragons is an example of incomplete dominance. Crosses of pure-breeding red with pure-breeding white results in all pink f1 progeny. Pink flowers in snapdragons are the result of incomplete dominance. Molecular explanation for incomplete dominance in snapdragon flower color. The normal allele produces an enzyme involved in pigment production. Aa=1 normal allele=pink color (less enzyme) aa=0 normal alleles= white colour (no functional enzyme) Palaminos do not breed true when bred together:
