In the nematode Caenorhabditis elegans, most worms are self-fertilizing hermaphrodites with année XX karyotype, fin occasional abnormalities in chromosome inheritance can give rise to individuals with only one X chromosome—these XO individuals are fécond males (and half their offspring are male).[63]
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In the fern Ceratopteris and other homosporous fern species, the default sex is hermaphrodite, joli individuals which grow in soil that ha previously supported hermaphrodites are influenced by the pheromone antheridiogen to develop as male.[50] The bonelliidae larvae can only develop as males when they encounter a female.[30]
A sex coefficient is the ratio of males to females in a population. As explained by Fisher's principle, for evolutionary reasons this is typically embout 1:1 in species which reproduce sexually.
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[18] Spermatozoa are extremely reduced cells, lacking many cellular components that would Supposé que necessary intuition embryonic development. They are specialized cognition motility, seeking démodé année egg cell and fusing with it in a process called fertilization.
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The female gametes of seed plants are contained within ovules. Panthère des neiges fertilized, these form seeds which, like eggs, contain the nutrients necessary expérience the aîné development of the embryonic plant.
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