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In Y-centered sex determination, the SRY gene is the main gene in determining male characteristics, but multiple genes are required to develop testes. In XY mice, lack of the gene DAX1 on the X chromosome results in sterility, but in humans it causes adrenal hypoplasia congenita. Some species, such as fruit flies , use the presence of two X chromosomes to determine femaleness. Some fish have variants of the XY sex-determination system , as well as the regular system.
For example, while having an XY format, Xiphophorus nezahualcoyotl and X. At least one monotreme , the platypus , presents a particular sex determination scheme that in some ways resembles that of the ZW sex chromosomes of birds and lacks the SRY gene. Although it is an XY system, the platypus' sex chromosomes share no homologues with eutherian sex chromosomes.
However, homologues to the avian DMRT1 gene on platypus sex chromosomes X3 and X5 suggest that it is possible the sex-determining gene for the platypus is the same one that is involved in bird sex-determination. More research must be conducted in order to determine the exact sex determining gene of the platypus. In this variant of the XY system, females have two copies of the sex chromosome XX but males have only one X0. The 0 denotes the absence of a second sex chromosome.
Generally in this method, the sex is determined by amount of genes expressed across the two chromosomes. This system is observed in a number of insects, including the grasshoppers and crickets of order Orthoptera and in cockroaches order Blattodea. A small number of mammals also lack a Y chromosome. These include the Amami spiny rat Tokudaia osimensis and the Tokunoshima spiny rat Tokudaia tokunoshimensis and Sorex araneus , a shrew species. Transcaucasian mole voles Ellobius lutescens also have a form of XO determination, in which both sexes lack a second sex chromosome.
The nematode C. These genes reduce male gene activation and increase it, respectively. The ZW sex-determination system is found in birds, some reptiles, and some insects and other organisms. The ZW sex-determination system is reversed compared to the XY system: females have two different kinds of chromosomes ZW , and males have two of the same kind of chromosomes ZZ. In the chicken, this was found to be dependent on the expression of DMRT1. In the case of the chicken, their Z chromosome is more similar to humans' autosome 9.
This is due to the fact that the haploid eggs double their chromosomes, resulting in ZZ or WW. The ZZ become males, but the WW are not viable and are not brought to term. In some Bryophyte and some algae species, the gametophyte stage of the life cycle, rather than being hermaphrodite, occurs as separate male or female individuals that produce male and female gametes respectively.
When meiosis occurs in the sporophyte generation of the life cycle, the sex chromosomes known as U and V assort in spores that carry either the U chromosome and give rise to female gametophytes, or the V chromosome and give rise to male gametophytes. Haplodiploidy is found in insects belonging to Hymenoptera , such as ants and bees.
Unfertilized eggs develop into haploid individuals, which are the males. Diploid individuals are generally female but may be sterile males. Males cannot have sons or fathers. This may be significant for the development of eusociality , as it increases the significance of kin selection , but it is debated. This allows them to create more workers, depending on the status of the colony. Many other sex-determination systems exist. In some species of reptiles, including alligators , some turtles , and the tuatara , sex is determined by the temperature at which the egg is incubated during a temperature-sensitive period.
There are no examples of temperature-dependent sex determination TSD in birds. Megapodes had formerly been thought to exhibit this phenomenon, but were found to actually have different temperature-dependent embryo mortality rates for each sex.
The specific temperatures required to produce each sex are known as the female-promoting temperature and the male-promoting temperature. It is unknown how exactly temperature-dependent sex determination evolved. For example, a warmer area could be more suitable for nesting, so more females are produced to increase the amount that nest next season.
There are other environmental sex determination systems including location-dependent determination systems as seen in the marine worm Bonellia viridis — larvae become males if they make physical contact with a female, and females if they end up on the bare sea floor.
This is triggered by the presence of a chemical produced by the females, bonellin. In tropical clown fish , the dominant individual in a group becomes female while the other ones are male, and bluehead wrasses Thalassoma bifasciatum are the reverse. Some species, however, have no sex-determination system.
Hermaphrodite species include the common earthworm and certain species of snails. A few species of fish, reptiles, and insects reproduce by parthenogenesis and are female altogether. There are some reptiles, such as the boa constrictor and Komodo dragon that can reproduce both sexually and asexually, depending on whether a mate is available.
Other unusual systems include those of the swordtail fish [ clarification needed ] ;  the Chironomus midges [ clarification needed ] [ citation needed ] ; the platypus , which has 10 sex chromosomes  but lacks the mammalian sex-determining gene SRY, meaning that the process of sex determination in the platypus remains unknown;  the juvenile hermaphroditism of zebrafish , with an unknown trigger;  and the platyfish , which has W, X, and Y chromosomes.
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Rating details. All Languages. More filters. Sort order. Start your review of Animal Sex 5 Story Bundle. Emily added it Jul 10, There are no discussion topics on this book yet. This one's a female. And you see that tiny parasite on her side? That's the male. It would be like if a human male only came up to a woman's ankle.
Instead of hunting for his own food, the male bites into the female, fusing his body with hers and living off the nutrients in her blood In return, he provides the one thing he has to offer: sperm. But there's a catch. In the process, his body shrivels up. He loses his eyes, fins, and most internal organs, until, ultimately, he becomes just a portable sperm bank for the female. Fortunately, not all males have it that rough. The short-beaked echidna survives mating. But his sex life is anything but ordinary.
He'll line up with around nine other males and follow a single female for up to a month during mating season. But here's the interesting part. Females have a forked reproductive tract.