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Find out what separates life from nonlife, and glimpse how scientists are exploring the boundary. Sign in now if you're a subscriber. To make the move from asexual to sexual reproduction, nature took a system by which parent cells reproduced simply by dividing asexual reproduction and altered it to allow two parent cells to combine to create offspring sexual reproduction.

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But what do they really mean? Related content from Pigeon Breeding: Genetic Linkage Sex Linkage. When an egg and sperm unite to make a fertilized egg, the chromosomes add up to equal To read a set of chromosomes, scientists look for key features to identify their similarities and differences.

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