(biology) Each of the two forms of an organism whose life cycle involves alternation of generations, or the fact of such alternation occurring in a given organism.
(biology) A reproductive strategy in some amphibians wherein the male will inseminate a fresh newly-dead female corpse, fertilizing the still viable eggs, and then squeezing the corpse to eject the newly fertilized eggs into the water.
An observation about the early stage of speciation, stating that if in a species hybrid only one sex is inviable or sterile, that sex is more likely to be the heterogametic sex.
(biology) A form of reproduction resembling parthenogenesis, but hemiclonal rather than completely asexual: half the genome is passed intact to the next generation, while the other half is discarded. It occurs in some animals that are hybrids between species.
(biology, obsolete or historical) The apparent repetition, during the development of a single embryo, of changes that occurred previously in the evolution of its species.
A mechanism for heredity proposed by Charles Darwin by which the cells of the body shed "gemmules" which collect in the reproductive organs prior to fertilization.
(biology) A phenomenon, involving a complex form of mitosis, whereby two cell nuclei merge without any sexual process and the chromosome count is doubled.
(biology, historical) The old theory that the newly created being is formed by the mixture of the seed of the male with the supposed seed of the female.
(biology) Having only some sexual characteristics; relating to a form of parthenogenesis in which the embryo develops from a cell produced by a modified form of meiosis
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