2007-01-08 07:23:30 · 7 answers · asked by Anonymous in Science & Mathematics ➔ Biology
Genetic variation refers to the variation in the genetic material of a population or species, and includes the nuclear, mitochodrial, ribosomal genomes as well as the genomes of other organelles. New genetic variation is caused by genetic mutation, which may take the form of recombination, migration and/or alterations in the karyotype (the number, shape, size and internal arrangement of the chromosomes). Genetic drift is a statistical measure of the rate of genetic variation in a population.
For example, all humans are members of the same species, Homo sapiens, but no two individuals are exactly alike. Even for twins, there are slight differences in their DNA. For the global population, there are many similarities and differences among people. For example, eye colour and blood type differ among individual Homo sapiens. Differences in these traits are due to genetic differences, or genetic variation.
2007-01-08 07:33:30 · answer #1 · answered by miz 2 · 0⤊ 0⤋
It comes from mistakes in copying DNA. A molecule of DNA, if stretched out, is ten feet long. The information contained in every cell in your body could fil several hundred Bibles with nothing but tiny A's, T's, G's and C's.
And each cell can copy its DNA in one hour. Every once in a while, a mistake is made. Those are the variations. The vast majority have no affect whatsoever. But many mistakes cause the malformation of essential proteins that can hasten death or prolong life.
For example, Sickle cell anemia is caused by a wrongly coded protein. Because of one letter change, an amino acid in hemoglobin is switched. Usually, this protein can function normally. When the body's oxygen level drops, the variation hemoglobin causes all red blood cells to bend in to "sickles" and is extremely painful, and may shorten their lives overall. However, these people are resistant to malaria because the parasite can't survive in their blood.
So, in some parts of the world, people with this mutation die early, but in Africa where malaria is common they live longer.
2007-01-08 07:31:34 · answer #2 · answered by Earth Queen 4 · 0⤊ 0⤋
In any population, the organisms differ from one another. Some of those differences are the result of individuals having different alleles for some of their genes. That results in genetic variation in the population.
2007-01-08 07:28:36 · answer #3 · answered by hcbiochem 7 · 1⤊ 0⤋
Genetic variationsis all about mutations, gene flow, gene alterations, new gene combinations and so on where the genetic structure is altered or modified.
2007-01-08 07:27:37 · answer #4 · answered by tonycharms05 2 · 2⤊ 0⤋
genetic version relies upon on the size of the gfee pool or length inhabitants in which you're breeding with. environmental version relies upon on geography and lcoale to get to others of your inhabitants in which you will breed.(issues that consequence this are bodies of water, miountains, valleys, ravines, all aspects of the particular panorama).
2016-12-12 07:05:52 · answer #5 · answered by ? 4 · 0⤊ 0⤋
confusing thing. look onto bing and yahoo. it can help!
2014-11-13 14:31:28 · answer #6 · answered by Anonymous · 0⤊ 0⤋
different d&a
2007-01-08 07:59:58 · answer #7 · answered by Anonymous · 0⤊ 0⤋