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  2. Sexual dimorphism - Wikipedia

    en.wikipedia.org/wiki/Sexual_dimorphism

    Males have a propensity to be larger than females of a comparable age but it is unclear whether the size increase is due to a growth spurt at the time of the sexual transition or due to the history of faster growth in sex changing individuals. [57] Larger males are able to stifle the growth of females and control environmental resources.

  3. Sex-determination system - Wikipedia

    en.wikipedia.org/wiki/Sex-determination_system

    Some chromosomal sex determination systems in animals A sex-determination system is a biological system that determines the development of sexual characteristics in an organism . [ 1 ] Most organisms that create their offspring using sexual reproduction have two common sexes, males and females , and in other species, there are hermaphrodites ...

  4. Temperature-dependent sex determination - Wikipedia

    en.wikipedia.org/wiki/Temperature-dependent_sex...

    The thermosensitive, or temperature-sensitive, period is the period during development when sex is irreversibly determined. It is used in reference to species with temperature-dependent sex determination, such as crocodilians and turtles. [12]

  5. Sequential hermaphroditism - Wikipedia

    en.wikipedia.org/wiki/Sequential_hermaphroditism

    Also a significantly lower percentage of larvae derived from self-fertilized eggs metamorphose, and the growth of the colonies derived from their metamorphosis is significantly lower. These findings suggest that self-fertilization gives rise to inbreeding depression associated with developmental deficits that are likely caused by expression of ...

  6. Parental investment - Wikipedia

    en.wikipedia.org/wiki/Parental_investment

    Sexual selection is an evolutionary concept that has been used to explain why, in some species, male and female individuals behave differently in selecting mates. In 1930, Ronald Fisher wrote The Genetical Theory of Natural Selection, [3] in which he introduced the modern concept of parental investment, introduced the sexy son hypothesis, and introduced Fisher's principle.

  7. Environmental sex determination - Wikipedia

    en.wikipedia.org/wiki/Environmental_sex...

    The sex of the green spoonworm, Bonellia viridis, a marine annelid, depends on where the larvae make landfall (female shown). Environmental sex determination is the establishment of sex by a non-genetic cue, such as nutrient availability, experienced within a discrete period after fertilization. [1]

  8. Evolution of sexual reproduction - Wikipedia

    en.wikipedia.org/wiki/Evolution_of_sexual...

    Sexually reproducing animals, plants, fungi and protists are thought to have evolved from a common ancestor that was a single-celled eukaryotic species. [1] [2] [3] Sexual reproduction is widespread in eukaryotes, though a few eukaryotic species have secondarily lost the ability to reproduce sexually, such as Bdelloidea, and some plants and animals routinely reproduce asexually (by apomixis ...

  9. Sex ratio - Wikipedia

    en.wikipedia.org/wiki/Sex_ratio

    In human societies, sex ratios at birth may be considerably skewed by factors such as the age of mother at birth [13] and by sex-selective abortion and infanticide. Exposure to pesticides and other environmental contaminants may be a significant contributing factor as well. [14]