what are the variations?how are they produced?
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Genotypic variations are caused by differences in number or structure of chromosomes or by differences in the genes carried by the chromosomes. ... Environmentally caused variations may result from one factor or the combined effects of several factors, such as climate, food supply, and actions of other organisms.
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Mutation can create entirely new alleles in the population giving rise to variation. It can also arise by random mating and fertilization. Other new alleles and organisms that carry new mutations and if they are not useful in the environmental conditions die out.
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