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Triploid progeny of pumpkinseed lepomis gibbosus x green sunfish lepomis cyanellus hybrids


Triploid progeny of pumpkinseed lepomis gibbosus x green sunfish lepomis cyanellus hybrids



Journal of Heredity 76(4): 251-257



ISSN/ISBN: 0022-1503

Female pumpkinseed .times. green sunfish hybrids from Hall's Pond, Connecticut, USA, were backcrossed to male pumpkinseed and male green sunfish. Offspring from these crosses are triploid and starch-gel electrophoresis shows they carry a double dose of the maternal genome. The female hybrids must produce unreduced, diploid eggs that are subsequently fertilized to yield triploid progeny. This is similar to the situation in parthenogenetic and gynogenetic vertebrates, where unreduced gametes are produced that develop, without fertilization, into female clones. Because the fertilized eggs of the female sunfish yield sterile triploids, a self-perpetuating diploid unisexual species has not arisen from these hybrids.

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Accession: 006842295

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