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Examples of human phenotypic variability: people with different levels of skin colors, a normal distribution of IQ scores, the tallest recorded man in history - Robert Wadlow - with his father. Human variability, or human variation, is the range of possible values for any characteristic, physical or mental, of human beings.
A graphical representation of the typical human karyotype The human mitochondrial DNA. Human genetic variation is the genetic differences in and among populations.There may be multiple variants of any given gene in the human population (), a situation called polymorphism.
No Two Alike: Human Nature and Human Individuality [1] is a book by psychology researcher Judith Rich Harris.It was published in February 2006. Harris attempts to explain why people are so different in personality, even identical twins who grow up in the same home.
This is an accepted version of this page This is the latest accepted revision, reviewed on 11 February 2025. "Skin pigmentation" redirects here. For animal skin pigmentation, see Biological pigment. Extended Coloured family from South Africa showing some spectrum of human skin coloration Human skin color ranges from the darkest brown to the lightest hues. Differences in skin color among ...
A different objection states that US racial groups are not biologically real because they are not objectively real in the sense of existing independently of some mental state of humans. Proponents of this second metaphysical objection include Naomi Zack and Ron Sundstrom.
Research has shown that people with CAH and XX chromosomes will be more likely to experience same-sex attraction, [12] and at least 5.2% of these individuals develop serious gender dysphoria. [14] In males with 5-alpha-reductase deficiency, conversion of testosterone to dihydrotestosterone is disrupted, decreasing the masculinization of ...
The people of the Ethiopian highlands also live at extremely high altitudes, around 3,000 meters (9,800 ft) to 3,500 meters (11,500 ft). Highland Ethiopians exhibit elevated hemoglobin levels, like Andeans and lowlander humans at high altitudes, but do not exhibit the Andeans’ increase in oxygen content of hemoglobin. [ 49 ]
Individuals also receive feedback from other individuals or groups about their own personality. This is a driving force of change because the individual has social motivations to change his or her personality; people often act a certain way based on the popular/majority vote of the people they are around.