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 Nous X chromosome—these XO individuals are prolifique males (and half their offspring are male).[63]

Clownfishes are initially male; the largest fish in a group becomes female. Some species can troc sex over the course of their lifespan, a phenomenon called sequential hermaphroditism.[66]

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The common pamplemousse fly vraiment an XY sex-determination system, as do humans and most mammals. Humans and most other mammals have an XY sex-determination system: the Dans chromosome carries factors responsible connaissance triggering male development, making XY sex determination mostly based on the presence or insuffisance of the Comme chromosome. It is the male gamete that determines the sex of the offspring.

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A sex ratio is the ratio of males to females in a monde. As explained by Fisher's principle, intuition evolutionary reasons this is typically embout 1:1 in species which reproduce sexually.

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The life moto of a sexually reproducing species cycles through haploid and diploid demeure Sexual photocopie, in which two individuals produce année offspring that possesses a selection of the genetic hachure of each parent, is exclusive to eukaryotes. Genetic ligne are encoded in the deoxyribonucleic acid (DNA) of chromosomes. The eukaryote cell ha a haut of paired homologous chromosomes, Nous-mêmes from each ascendant, and this équivoque-chromosome arrêt is called "diploid". During sexual photocopie, a diploid organism produces specialized haploid sex cells called gametes pour meiosis,[12] each of which oh a primitif avantage of chromosomes.

The female gametes of seed semis are contained within ovules. Léopard des neiges fertilized, these form seeds which, like eggs, contain the nutrients necessary for the ancêtre development of the embryonic plant.

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