Bartleby QUESTION: Human immunodeficiency virus entered human populations after evolving from a simian immunodeficiency virus. Nikolaas Tinbergen (1963) 1 proposed explaining shifts in traits from two perspectives: dynamic versus static, and proximate versus ultimate. This framework can be used to understand the evolution of a trait in four ways: (i) causation (proximate/static): the mechanism of the trait as it works in the present; (ii) survival value (ultimate/static): how function of the trait enhances survival or reproduction; (iii) ontogeny (proximate/dynamic): the development of the trait in an individual; and (iv) evolution (ultimate/dynamic): the phylogenetic history of the trait. Use these categories to discuss the causes for the virus shifting to humans from other primates.

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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.