University:
York University
Course:
BIOL 2040 | Genetics
Academic year:

2019
Views:

196

Pages:

1
Author:

Nick T.

Chapter 3: Extensions to Mendel's Laws Dominance is not always complete. Incomplete + O = Codominance. = ★Pleiotropy - one gene may contribute to Several characteristics. Recessive lethal alleles. Delayed Lethality. Variation in dominance relations do not negate Mendel's laws of Segregation. Freq. of gametes with mutations is 10^-10 Mutations that result in phenotypic variants can be used by geneticists to follow gene transmission. Monomorphic = More than one wild type Polymorphic > 1 common alleles. Novel phenotypes = result from gene interactions. Epistasis = when one gene masks the phenotype trying to be expressed @ another gene. Heterozygous traits = have the same phenotype but are caused by mutations in different genes. Discontinuous traits = "either or" Continuous = height + skin color = variants.