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New alleles

Occasionally, DNA mutations occur in germ cells - cells destined to become eggs or sperm. In this case, the DNA mutation is copied into every new cell of the growing embryo following fertilisation. In this way, new DNA variants are passed on to the next generation. If the mutation affects a gene, it will result in a new version of that gene - a new allele.

Human variation arises from DNA mutation.
Human variation arises from DNA mutation.
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