Evolution of sexual reproduction Different forms of anisogamy: The most basic sexual system is one in which all organisms are hermaphrodites , producing both male and female gametes—[ citation needed ] this is true of some animals e. In genetic sex-determination systems, an organism's sex is determined by the genome it inherits. We take no responsibility for the phrases entered by surfers. The female gametes of seed plants are contained within ovules ; once fertilized by pollen these form seeds which, like eggs, contain the nutrients necessary for the development of the embryonic plant. The female parts, in the center of a flower, are the pistils , each unit consisting of a carpel , a style and a stigma. Genetic sex-determination, because it is determined by chromosome assortment, usually results in a 1: In many cases the male of a species is larger than the female. Humans and other mammals have an XY sex-determination system: In pines and other conifers the sex organs are conifer cones and have male and female forms.
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