My grandmother is a communist.
atural selection occurs in a population of organisms of the same species when the individuals:
I agree they mate and natural selection occurs
atural selection occurs in a population of organisms of the same species when the individuals:
When organisms mate natural selection occurs
has given rise to biodiversity at every level of biological organisation, including the levels of species, individual organisms and molecules.
The scientific theory of evolution by natural selection was proposed by Charles Darwin and Alfred Russel Wallace in the mid-19th century and was set out in detail in Darwin's book "On the Origin of Species" (1859). Evolution by natural selection was first demonstrated by the observation that more offspring are often produced than can possibly survive. This is followed by three observable facts about living organisms: 1)
Genetic purging
Genetic purging is the reduction of the frequency of a deleterious allele, caused by an increased efficiency of natural selection prompted by inbreeding.
Purging occurs because many deleterious alleles only express all their harmful effect when homozygous, present in two copies. During inbreeding, as related individuals mate, they produce offspring that are more likely to be homozygous. Deleterious alleles appear more often, making individuals less fit genetically, i.e. they pass fewer copies of their genes to future generations. Put another way, natural selection purges the