Biology 1201A Chapter Notes - Chapter 18: Genotype Frequency, Allele Frequency, Lethal Allele
4 Aug 2017
School
Department
Course
Professor
Document Summary
18. 1 variation in natural populations: phenotypic variation differences in appearance / function among indvs of a population, difference is heritable. 18. 1a phenotypic variation: darwin"s theory recognized importance of heritable phenotypic variation, quantitative variation indvs differ in small incremental ways. Usually data in displayed on a bar graph or as a curve. Diffs in the enviro factors that indvs experience. Operates on the whole of the phenotype: enviro factors can in uence the expression of genes, organism"s phenotype product of an interaction btwn its genotype and its enviro, breeding experiments demonstrate genetic phenotypic variation. 18. 1b genetic variation: allele one member of a gene pair that occupies a single location (locus) on a chromosome, gene can have more than one possible allele, diploid organisms . Only 2 of these alleles are present in any gene pair: haploid organisms . Only one of each type of allele: genetic variation . Random fertilizations btwn genetically diff sperm and eggs.
