Genetic variation is fundamental to evolution. The less variation there is the slower and less effective evolution becomes. Evolution works by selecting for or against different variations of a trait. In this way species are able to adapt to environmental changes.
Species that have many variations of a trait are better suited to adapt to environmental changes by evolving. A classic example of this is the gene that codes for hemoglobin. Many alleles (or variations) exist for this gene due to genetic mutations. 2 common variations are the HbA and HbS alleles. HbA is dominant and codes for normal hemoglobin. HbS on the other hand is recessive and codes for mutant sickled hemoglobin. So individuals that are homozygous HbS (they have the HbS/HbS genotype) have a deadly disease called sickle cell anemia. However, in certain parts of the world malaria is a common disease that works by effecting blood cells. It turns out that heterozygotes (HbA/HbS) have a natural immunity to malaria. So here, genetic variation gives evolution a chance to "defeat" the malaria disease by favoring heterozygotes. If no variation existed in the gene that codes for hemoglobin, such adaptation would be impossible.
a greater variety of traits help species by allowing the animal to adapte to the cold or warm faster than other animals and then the animals have a better chance of living.
It will increase the chance by natural selection.
by natural selection.
Burning fossil fuels like coal, oil, and natural gas increase the amount of carbon in the environment.
To increase.
Neutrons
Glucose utilization would increase a little
by natural selection.
Increase, of course.
because of the changing lifestyle of the Indian people,their psychology about shopping and the increase in the disposable income
That is the definition of stabilizing selection.
A well stated definition of what stabilizing selection is, so true.
Cross plants that have very different characteristics
Carbon Dioxide would increase in the environment if the rain forests are demolished.
Increase
no
You change the intensity.
Burning fossil fuels like coal, oil, and natural gas increase the amount of carbon in the environment.
no