Most organisms that produce sexually have two copies of each gene, because each parent cell or organism donates a single copy of its genes to its offspring. ... Mutations, the changes in the sequences of genes in DNA, are one source of genetic variation.
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Answer:
Most organisms that produce sexually have two copies of each gene, because each parent cell or organism donates a single copy of its genes to its offspring. ... Mutations, the changes in the sequences of genes in DNA, are one source of genetic variation.