Dekaylen umber of human diseases result from chromosomal abnormalities. Individuals with cri du chat syndrome have a tinctive cry as an infant, slower growth, and reduced head size. Diagrams of chromosome 5 from an unaffected a Tected individual are shown below. Unaffected Individual Affected Individual Which of the following best explains how this difference results in the phenotypic change? A section of the chromosome that stimulates brain growth was transferred to the other chromosome. * Genes within the chromosome were inverted and disrupted normal development. Sections of each chromosome have been duplicated in unaffected individuals. Genes deleted from the chromosome are necessary for development.

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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.