A mating between two heterozygous people with widow's peaks and free earlobes (Eeww) Key: E= free earlobes e = attached earlobes W = widow's peak w = straight hairline EW EEWW EEWW Ew eW ew EeWw Eeww eeWw EEWW EeWW EeWw eeWW eeWw EW Ew EeWw Eeww eW EeWW EeWw eeww ew Genotypes: Genotype Count eEwW EEWW EEWW eEww Percent Trait Heterozogous free earlobes, Heterozogous widow's peak Homozogous free earlobes, Heterozogous widow's peak Heterozogous free earlobes, Homozogous widow's peak Heterozogous free earlobes, Homozogous straight hairline Homozogous attached earlobes, Heterozogous widow's peak Homozogous free earlobes, Homozogous widow's peak Homozogous free earlobes, Homozogous straight hairline Homozogous attached earlobes, Homozogous widow's peak Homozogous attached earlobes, Homozogous straight hairline 4 25 12.5 2 12.5 12.5 2 eewW 2 12.5 EEWW 1 6.3 EEww 1 6.3 eewW 1 6.3 eeww 1 6.3 Phenotypes: Phenotype [ peE pwW] [ pE pwW] I peE pW] [ peE pw] [ pe pwW] 1 Count Percent 4 25 12.5 12.5 12.5 12.5 [pE pW] [ pɛ pw] Грe pW] [ pe pw] 6.3 1 6.3 1 6.3 1 6.3 NINcolaolo

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Genetic Variation

Genetic variation refers to the variation in the genome sequences between individual organisms of a species. Individual differences or population differences can both be referred to as genetic variations. It is primarily caused by mutation, but other factors such as genetic drift and sexual reproduction also play a major role.

Quantitative Genetics

Quantitative genetics is the part of genetics that deals with the continuous trait, where the expression of various genes influences the phenotypes. Thus genes are expressed together to produce a trait with continuous variability. This is unlike the classical traits or qualitative traits, where each trait is controlled by the expression of a single or very few genes to produce a discontinuous variation.