- 行业: Education
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Founded in 1946, Palomar College is a public two-year community college in the city of San Marcos, located in north San Diego County, California. Palomar offers over 300 associate degree, certificate programs and is designated by the U.S. Department of Education as an Hispanic-Serving Institution ...
Дискретные, нитевидные, несущих ген тело в ядре клетки. Хромосомы состоят главным образом из ДНК и белков. Они видны только под увеличением на определенных этапах деления клеток. Люди имеют 46 хромосом в каждой соматической клетке и 23 в каждой ячейке секс.
Industry:Anthropology
Sejarah evolusi dimana spesies pada dasarnya tetap tidak berubah selama ratusan ribu atau bahkan jutaan tahun dan kemudian mengalami periode singkat evolusi yang sangat cepat. Periode bersela, atau perubahan yang cepat, merupakan hasil perubahan lingkungan utama dalam tekanan pemangsaan, pasokan makanan, iklim, dll. Selama masa ini, seleksi alam dapat mendukung varietas yang sebelumnya pada kerugian komparatif. Hasilnya adalah tingkat percepatan perubahan dalam frekuensi gen ke arah varietas yang paling disukai oleh kondisi lingkungan baru. Lihat gradualisme filetik.
Industry:Anthropology
A genetically inherited disease in children that results in chronic fluid development in the lungs, making breathing difficult. This disease also prevents normal absorption of fats and other nutrients from food. Cystic fibrosis occurs as a result of inheriting a recessive allele for if from both parents. This is ultimately a fatal disease, but with modern medical care, about 2/3 of the people with it survive into early adulthood. About 30,000 people have cystic fibrosis in the U. S. Today.
Industry:Anthropology
A biological trait that has not changed over time from the ancestral form and/or function that was present in the species from which it came. See cladistics.
Industry:Anthropology
A medical condition characterized by fatigue, weakness, poor appetite, weight loss, and paleness or a yellowish tinge to the skin and eyes resulting from a deficiency of red blood cells or insufficient amounts of hemoglobin molecules within the red cells. The result in both cases is a significantly reduced ability to get oxygen to the cells of the body. There are many different genetic and environmental causes of anemia.
Industry:Anthropology
The virus that is responsible for causing AIDS.
Industry:Anthropology
Within the same species of warm-blooded animals, individuals from populations living in colder environments usually have greater body mass than do those from populations in warmer areas. This is because of the selective advantage it provides. A massive body produces more internal heat and radiates relatively less of it into the surrounding environment because the skin surface area is relatively smaller. Subsequently, a massive body produces and retains more heat. Bergmann's Rule was named after Carl Bergmann, a19th century naturalist. See Allen's Rule.
Industry:Anthropology
Within the same species of warm-blooded animals, individuals from populations living in colder environments usually have shorter appendages than do those from populations in warmer areas. This is because of the selective advantage it provides. Short arms, legs, and other appendages have relatively less skin surface area that can radiate heat into the surrounding environment. Subsequently, the body retains more of it. Allen's Rule is a corollary of Bergmann's Rule. Allen's Rule was named after Joel Allen, a 19th century naturalist.
Industry:Anthropology
A general term referring to any of the discrete structures within a cell that perform specific functions (e. G. , mitochondria).
Industry:Anthropology
A mating pattern in which one male has more than one female mate. Polygyny is common among primates. It is found among hamadryas baboons, geladas, langurs, howler monkeys, gorillas and many human societies. It has been a culturally preferred marriage pattern in numerous Native American, African, and South Asian cultures. However, polygyny is not as common among humans as monogamy, even in cultures that advocate it.
Industry:Anthropology
