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The majority of butterflies and moths also have a ZW sex-determination system. In both XY and ZW sex determination systems, the sex chromosome carrying the critical factors is often significantly smaller, carrying little more than the genes necessary for triggering the development of a given sex.

Many insects use a sex determination system based on the number of sex chromosomes. This is called X0 sex-determination —the 0 indicates the absence of the sex chromosome.

All other chromosomes in these organisms are diploid, but organisms may inherit one or two X chromosomes.

In field crickets , for example, insects with a single X chromosome develop as male, while those with two develop as female.

Other insects, including honey bees and ants , use a haplodiploid sex-determination system. This sex-determination system results in highly biased sex ratios , as the sex of offspring is determined by fertilization rather than the assortment of chromosomes during meiosis.

For many species, sex is not determined by inherited traits, but instead by environmental factors experienced during development or later in life.

Many reptiles have temperature-dependent sex determination : the temperature embryos experience during their development determines the sex of the organism.

Many fish change sex over the course of their lifespan, a phenomenon called sequential hermaphroditism. In clownfish , smaller fish are male, and the dominant and largest fish in a group becomes female.

In many wrasses the opposite is true—most fish are initially female and become male when they reach a certain size. Sequential hermaphrodites may produce both types of gametes over the course of their lifetime, but at any given point they are either female or male.

In some ferns the default sex is hermaphrodite, but ferns which grow in soil that has previously supported hermaphrodites are influenced by residual hormones to instead develop as male.

Many animals and some plants have differences between the male and female sexes in size and appearance, a phenomenon called sexual dimorphism.

Sex differences in humans include, generally, a larger size and more body hair in men; women have breasts, wider hips, and a higher body fat percentage.

In other species, the differences may be more extreme, such as differences in coloration or bodyweight. Sexual dimorphisms in animals are often associated with sexual selection —the competition between individuals of one sex to mate with the opposite sex.

In many cases the male of a species is larger than the female. Mammal species with extreme sexual size dimorphism tend to have highly polygynous mating systems—presumably due to selection for success in competition with other males—such as the elephant seals.

Other examples demonstrate that it is the preference of females that drive sexual dimorphism, such as in the case of the stalk-eyed fly.

Other animals, including most insects and many fish, have larger females. This may be associated with the cost of producing egg cells, which requires more nutrition than producing sperm—larger females are able to produce more eggs.

Some plant species also exhibit dimorphism in which the females are significantly larger than the males, such as in the moss Dicranum [52] and the liverwort Sphaerocarpos.

In birds, males often have a more colourful appearance and may have features like the long tail of male peacocks that would seem to put the organism at a disadvantage e.

One proposed explanation for this is the handicap principle. From Wikipedia, the free encyclopedia. This article is about sex in sexually reproducing organisms.

For the act, see Sexual intercourse. For other uses, see Sex disambiguation. Specialization of organisms into male or female varieties.

Main article: Evolution of sexual reproduction. Different forms of anisogamy : A anisogamy of motile cells, B oogamy egg cell and sperm cell , C anisogamy of non-motile cells egg cell and spermatia.

Different forms of isogamy: A isogamy of motile cells , B isogamy of non-motile cells, C conjugation.

Main article: Sexual reproduction. Further information: Isogamy and Anisogamy. Main article: Sexual reproduction in animals. Main article: Plant reproduction.

Female left and male right cones are the sex organs of pines and other conifers. Main article: Mating in fungi.

Main article: Sex-determination system. Main article: Environmental sex determination. Main article: Sexual dimorphism.

OUP Oxford. Retrieved 23 March Sex: Either of the two main categories male and female into which humans and most other living things are divided on the basis of their reproductive functions.

The fact of belonging to one of these categories. The group of all members of either sex. Life: The Science of Biology.

A single body can function as both male and female. Sexual reproduction requires both male and female haploid gametes. In most species, these gametes are produced by individuals that are either male or female.

Species that have male and female members are called dioecious from the Greek for 'two houses'. In some species, a single individual may possess both female and male reproductive systems.

Such species are called monoecious "one house" or hermaphroditic. Columbia University Press. The Biology of Reproduction.

Cambridge University Press. The Fungi. Elsevier Science. Retrieved 18 February Biology of Plants 7th ed. NY: Freeman and Company Publishers.

Genetics: Conjugation 4th ed. University of Texas. Biological Science 3rd ed. Pearson Prentice Hall. Living at Micro Scale. Cambridge, Massachusetts: Harvard University Press.

The Evolution of Sex Determination. Oxford University Press. Jupiter Scientific. Retrieved 7 April Proceedings: Biological Sciences.

Sex determination in multicellular organisms and protistan mating types". Evolution of sex determining mechanisms. Journal of Molluscan Studies.

Walter de Gruyter. Cellular and Molecular Life Sciences. Annual Review of Genetics. Cytogenetic and Genome Research.

December Bibcode : Natur. National Institutes of Health, " V. The Benefits of Sex ". Meiosis", U. NIH, V. Multicellularity: Evolution of Differentiation".

Mul , NIH. Retrieved 4 June Caenorhabditis Elegans: Development as Indiv. Cell", U. Mendelian genetics in eukaryotic life cycles", U.

NIH, 3. Sperm", U. Eggs", U. Fertilization", U. Eastern Kentucky University. Retrieved 3 April Gamete Production in Angiosperms", U.

NIH, 4. Molecular Cell Biology Fourth ed. WH Freeman and Co. The Plant Cell. Cengage Learning. Journal of Neonatal Surgery. Biology of Reproduction.

Annenberg Media. Archived from the original on 4 November Retrieved 1 April Orthoptera: Gryllidae ". Entomological Science.

Elegans II. Cold Spring Harbor Laboratory Press. The Descent of Man. Murray, London. Proceedings of the Royal Society B. Archived from the original PDF on 10 September Journal of Zoology.

Extension Entomology. Archived from the original on 31 August Retrieved 8 August Jonathan Shaw, Bernard Goffinet eds.

Bryophyte Biology. Cambridge: Cambridge University Press. New Manual of Bryology. Mosses of Eastern North America.

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