- 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 ...
A similar evolutionary development in different species lines after divergence from a common ancestor that had the initial anatomical feature that led to it. Parallelism is thought to be due primarily to the independent species lines experiencing the same kinds of natural selection pressures. Parallelism is also referred to as parallel evolution. Parallelism results in homoplasies. See convergence.
Industry:Anthropology
داخل نفس الأنواع من الحيوانات ذوات الدم الحار، يكون الأفراد من السكان الذين يعيشون في البيئات الأكثر برودة، عادة ما تكون أكبر من كتلة الجسم من القيام بتلك من السكان في المناطق الأكثر دفئا. وهذا بسبب أنه يوفر ميزة انتقائية. هيئة ضخمة تنتج المزيد من الحرارة الداخلية ويشع أقل نسبيا منه في البيئة المحيطة بها لأن مساحة سطح الجلد أصغر نسبيا. وفي وقت لاحق، هيئة ضخمة تنتج وتحتفظ بالحرارة أكثر. كان اسمه القاعدة في برغمان بعد كارل برغمان، a19th القرن الطبيعة. انظر القاعدة الين.
Industry:Anthropology
A group of closely related species. In the Linnaean classification system, genus is the category immediately above species.
Industry:Anthropology
A class of feminizing hormones. Both men and women produce them, but females normally produce much more.
Industry:Anthropology
A genetic trait controlled by more than one allele, each of which has a frequency of 1% or greater in the population gene pool. See balanced polymorphism.
Industry:Anthropology
A more or less distinct group of individuals within a species who are reproductively isolated from other groups. In other words, they restrict their mate selection to members of their own population. This is usually due to geographic and/or social barriers to mating with outsiders. Members of a completely isolated small population tend to have similar genetic characteristics due to generations of inbreeding.
Industry:Anthropology
A date that places an event in its chronological position with reference to a universal time scale such as a calendar. Such dates usually are given in terms of the number of years before or after a calendar starting point. For instance, 1950 B. C. Was 1950 years before the beginning date of the Gregorian calendar, which is commonly used today. Chronometric dating methods include the use of written records, dendrochronology, and radiometric methods. See relative date.
Industry:Anthropology
A class of cancers of the blood cells and blood-forming organs resulting in exceptionally high leukocyte (white blood cell) production. Other organs can become involved as well. Leukemia can be caused by some viruses, chemicals, and radiation. However, there also may be a genetic connection. For instance, individuals with Down syndrome have a much higher chance of developing leukemia.
Industry:Anthropology
A class of masculinizing hormones. Both men and women produce them, but males normally produce much more. Testosterone is mainly produced in the testes of males. Smaller amounts are produced by the cortex of the adrenal glands in both males and females.
Industry:Anthropology
A cell that has a true nucleus and that divides by mitosis. Complex single celled creatures such as protozoa as well as all multicelled plants and animals are primarily eukaryotes. With the exception of red blood cells, human cells are eukaryotic. See prokaryotic cell.
Industry:Anthropology
