Mendelian Genetics (Monohybrid Cross) A. In dogs, a dominant gene (W) produces wire-haired texture. The recessive allele (w) produces smooth hair. A homozygous wire-haired male is mated to a homozygous female with smooth hair. What genotypes and phenotypes are expected i n their offsprings. Show the results of the crosses, the genotypic and phenotypic ratios. B. Normal pigmentation in humans result to a dominant allele (A), in which albinism results from the recessive allele (a). Two heterozygous individuals plan to have a child. What are the phenotypes of the parents? What is the chance that the child will be albino?

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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.