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asexually. Although sexually reproducing diploids (2n = 50) are most common in Japan, asexual clones also occur in a few wild populations. Clonally reproducing diploid loaches produce unreduced diploid eggs that develop into identical clones (without any genetic contribution from sperm) by the process of gynogenesis. During gynogenesis, an egg is activated by a sperm that degenerates without fusing with the egg nucleus, so that the resulting embryo contains only maternal chromosomes.

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