State of having just one sex in any individual organism
In
biology , gonochorism is a
sexual system where there are two
sexes and each individual organism is either
male or
female .
[1] The term gonochorism is usually applied in animal species, the vast majority of which are gonochoric.
[2] : 212–222
Gonochorism contrasts with
simultaneous hermaphroditism but it may be hard to tell if a species is gonochoric or sequentially hermaphroditic. (e.g.
parrotfish ,
Patella ferruginea ).
[3] However, in gonochoric species individuals remain either male or female throughout their lives.
[4] Species that reproduce by
thelytokous parthenogenesis and do not have males can still be classified as gonochoric.
[5] [
clarification needed ]
Terminology
The term is derived from
Greek (gone , generation) + (chorizein, to separate).
[6] The term gonochorism originally came from German Gonochorismus .
[7]
Gonochorism is also referred to as unisexualism or gonochory.
Evolution
Gonochorism has
evolved independently multiple times.
[8] It is very evolutionarily stable in animals.
[9] Its stability and advantages have received little attention.
[10] : 46 Gonochorism owes its origin to the evolution of
anisogamy ,
[11] but it is unclear if the evolution of anisogamy first led to hermaphroditism or gonochorism.
[2] : 213
Gonochorism is thought to be ancestral in
polychaetes ,
[9] : 126
hexacorallia ,
[12] : 74
nematodes ,
[13] : 62 and hermaphroditic
fishes . Gonochorism is thought to be ancestral in hermaphroditic fishes because it is widespread in
basal
clades of fish and other vertebrate lineages.
[14]
Two papers from 2008 have suggested that transitions between hermaphroditism and gonochorism or vice versa have occurred in animals between 10 and 20 times.
[15] In a 2017 study involving 165 taxon groups, more evolutionary transitions from gonochorism to hermaphroditism were found than the reverse.
[16]
Use across species
Animals
The term is most often used with animals, in which the species are usually gonochoric.
Gonochorism has been estimated to occur in 95% of
animal species.
[17] It is very common in
vertebrate species, 99% of which are gonochoric.
[18]
[19] 98% of fishes are gonochoric.
[20]
Mammals (including
humans
[21]
[22] ) and
birds are solely gonochoric.
[23]
Tardigrades are almost always gonochoric.
[24] 75% of
snails are gonochoric.
[25]
Most
arthropods are gonochoric.
[26] For example a majority of
crustaceans are gonochoric.
[27]
In animals, sex is most often genetically determined, but may be determined by other mechanisms. For example,
alligators use
temperature-dependent sex determination during egg incubation.
Plants
Plants which have single-sex individuals are typically called
dioecious (
vascular plants )
[28] or
dioicous (
bryophytes )
[29] instead of gonochoric. In
flowering plants , individual flowers may be hermaphroditic (i.e. with both stamens and ovaries) or dioecious (unisexual), having either no stamens (i.e. no male parts) or no ovaries (i.e. no female parts). Among flowering plants with unisexual flowers, some also produce
hermaphrodite flowers, and the three types may occur in different arrangements on the same or separate plants. Plant species can thus be hermaphrodite,
monoecious ,
dioecious ,
trioecious ,
polygamomonoecious ,
polygamodioecious ,
andromonoecious , or
gynomonoecious .
Unlike most
flatworms ,
schistosomes are gonochoric. The narrow female can be seen emerging from the thicker male's gynecophoral canal below his ventral sucker.
Examples of species with gonochoric or dioecious
pollination include
hollies and
kiwifruit . In these plants the male plant that supplies the
pollen is referred to as the
pollenizer .
Other reproductive strategies
Gonochorism stands in contrast to other
reproductive strategies such as
asexual reproduction and
hermaphroditism . Closely related taxa can have differing sexual strategies – for example, the genus
Ophryotrocha contains species that are gonochoric and species that are hermaphrodites.
[30]
The sex of an individual may also change during its lifetime – this
sequential hermaphroditism can, for example, be found in
parrotfish
[31]
[32] and
cockles .
See also
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