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Migration in Biological Definition

Culture

... processes, since Columbus the world has been characterized by migration on a major scale, including colonial expansion and forced migration through slavery . The result is that many societies are culturally ...

Allele frequency

... distribution and frequencies of alleles -- in other words, to evolution . Besides selection, these forces include genetic drift , mutation and migration . Compare genotype frequency . Example If there are ten individuals in a population and at a given locus there are two possible alleles, A ...

Gel electrophoresis

... to the natural negative charge carried on their sugar - phosphate backbone. Double-stranded DNA fragments natually behave as long rods, so their migration through the gel is relative to their radius of gyration , or, roughly, size. Single-stranded DNA or RNA tend to fold up into molecules with complex ...

Evolution

... Gene flow Gene flow (or gene admixture) is the only mechanism whereby populations can become closer genetically while building larger gene pools. migration of one population into another area occupied by a second population can result in gene flow. Gene flow operates when geography and culture are not ...

Gel electrophoresis

... to the natural negative charge carried on their sugar - phosphate backbone. Double-stranded DNA fragments natually behave as long rods, so their migration through the gel is relative to their radius of gyration , or, roughly, size. Single-stranded DNA or RNA tend to fold up into molecules with complex ...

Genetics

... change in allele frequencies of genes under the influence of the four evolutionary forces: natural selection , genetic drift , mutation and migration . It is the theory that attempts to explain such phenomena as adaptation and speciation . The related subfield of quantitative genetics, which ...

Hardy-Weinberg principle

... eliminate genetic drift ) sexually reproducing randomly mating diploid and experience: no selection no mutation no migration ( gene flow ) Causes of deviation When the Hardy–Weinberg assumptions are not met this can cause deviations from expectation , but ...

Human

... University [11] ; and the Americas 30,000 years ago, with a second colonization from across the Pacific Ocean 15,000 years ago. (See Human migration .) Since the human embryo normally takes its mitochondrial DNA from its mother's egg and not from the sperm , variations in human ...

Major histocompatibility complex

... inside the cell; extracellular proteins are endocytosed , digested in lysosomes , and bound by the class II MHC molecule prior to the molecule's migration to the plasma membrane. The peptides are longer, generally between 15-24 amino-acid residues. Because class II Mhc is loaded with ...

Meiosis

... meiosis I. The end of Prophase I (also known as Prometaphase I ) is signified by contraction and staining of all chromosomes, as well as the polar migration of centrioles , the dispersion of the nucleoli and nuclear envelope and the formation of the spindle fibres (including their attachment to ...

Population genetics

... of and change in allele frequencies under the influence of the four evolutionary forces: natural selection , genetic drift , mutation and migration . It also takes account of population subdivision and population structure in space. As such, it is the theory that attempts to explain such ...

Punctuated equilibrium

... evolution occurs by speciation in peripheral isolates? ... In any local area inhabited by ancestors, a descendant species should appear suddenly by migration from a peripheral region in which it evolved. In the peripheral region itself, we might find direct evidence of speciation, but such good fortune ...

Stem cell

... stem cells, and could potentially increase substantially the pace of embryonic stem cell research. Several states, in some cases wary of a national migration of biotech researchers to California, have shown interest in providing their own funding support of embryonic and adult stem cell research. These ...

Unsolved problems in biology

... chronobiology ? Why do cells generate electrical fields? Why is magnetite in living creatures? How do animals possess long-range navigation and migration abilities? How was the homing ability developed? How can some animals detect earthquake precursors ? What are organism's magnetic senses? What are ...
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