The sickle cell allele can be maintained in the central African population, above the frequency of gene mutation (balancing selection), because the heterozygous sickle cell individuals have an advantage in lifespan, in this malaria stricken region, over the homozygous alternatives. Homozygous sickle-sickle individuals die early from the sickle cell disease. Homozygous nonsickle-nonsickle die early from malaria. The heterozygous sickle-nonsickle have a higher survival against malaria and therefore the sickle cell allele is balanced selected.
European colonization of central Africa was delayed.
The fertile soils of the central rain forest draw people.
The fertile soils of the central rain forest draw people.
Humans directly affect artificial selection. They do this by selecting the specific traits that they prefer which they cannot don in a natural selection.
because furniture's have already lumber (or wood) that comes from the USA.
The migration of the Bantu speakers affected culture in the areas of central and southern Africa in a huge way. Some of the activities like farming were introduced and the Bantu language and other cultural values also spread rapidly.
How does a subscript affect the element just before it?
it had a negative affect in the farming economy if Africa
Organisms are affected by Natural Selection because Inherited characteristics affected the likelihood of an organism's survival and reproduction.
Both
species
Through ongoing natural selection a population adapts to its enviroment