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The vocal folds of children are much shorter than those of adult males and females. The difference in vocal fold length and thickness between males and females causes a difference in vocal pitch. Additionally, genetic factors cause variations between members of the same sex, with males' and females' voices being categorized into voice types.
Genetic variation Genetic variation of Eurasian populations showing different frequency of West- and East-Eurasian components. [56] It is commonly assumed that early humans left Africa, and thus must have passed through a population bottleneck before their African-Eurasian divergence around 100,000 years ago (ca. 3,000 generations).
Structural variation is an important type of human genetic variation that contributes to phenotypic diversity. [2] There are microscopic and submicroscopic structural variants which include deletions, duplications, and large copy number variants as well as insertions, inversions, and translocations. [1]
This high degree of genetic diversity hints at the origin of anatomically modern humans. [ 66 ] [ 67 ] A 2008 study suggested that the San may have been isolated from other original ancestral groups for as much as 50,000 to 100,000 years and later rejoined, re-integrating into the rest of the human gene pool.
Genetic distance. The genetic difference between humans and chimpanzees is less than 2%, [ 4 ] or three times larger than the variation among modern humans (estimated at 0.6%). [ 5 ]
Research on the heritability of IQ inquires into the degree of variation in IQ within a population that is due to genetic variation between individuals in that population. . There has been significant controversy in the academic community about the heritability of IQ since research on the issue began in the late nineteenth cent
Quantitative genetics is the study of quantitative traits, which are phenotypes that vary continuously—such as height or mass—as opposed to phenotypes and gene-products that are discretely identifiable—such as eye-colour, or the presence of a particular biochemical.
A genetic isolate is a population of organisms that has little to no genetic mixing with other organisms of the same species due to geographic isolation or other factors that prevent reproduction. Genetic isolates form new species through an evolutionary process known as speciation. All modern species diversity is a product of genetic isolates ...