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Sex is the trait that determines whether a sexually reproducing organism produces male or female gametes. A male organism produces small mobile gametes, while a female organism produces larger, non-mobile gametes. An organism that produces both types of gamete is called a hermaphrodite. During sexual reproduction, a male and a female gamete fuse to form a zygote, which develops into an offspring that inherits traits from each parent.
Thomas Hunt Morgan was an American evolutionary biologist, geneticist, embryologist, and science author who won the Nobel Prize in Physiology or Medicine in 1933 for discoveries elucidating the role that the chromosome plays in heredity.
A sex-determination system is a biological system that determines the development of sexual characteristics in an organism. Most organisms that create their offspring using sexual reproduction have two common sexes and a few less common intersex variations.
The Y chromosome is one of two sex chromosomes in therian mammals and other organisms. Along with the X chromosome, it is part of the XY sex-determination system, in which the Y is the sex-determining because it is the presence or absence of Y chromosome that determines the male or female sex of offspring produced in sexual reproduction. In mammals, the Y chromosome contains the SRY gene, which triggers development of male gonads. The Y chromosome is passed only from male parents to male offspring.
Irene Ayako Uchida, was a Canadian scientist and Down syndrome researcher.
In biology, gonochorism is a sexual system where there are only two sexes and each individual organism is either male or female. The term gonochorism is usually applied in animal species, the vast majority of which are gonochoric.
Nettie Maria Stevens was an American geneticist who discovered sex chromosomes. In 1905, soon after the rediscovery of Mendel's paper on genetics in 1900, she observed that male mealworms produced two kinds of sperm, one with a large chromosome and one with a small chromosome. When the sperm with the large chromosome fertilized eggs, they produced female offspring, and when the sperm with the small chromosome fertilized eggs, they produced male offspring. The pair of sex chromosomes that she studied later became known as the X and Y chromosomes.
Deborah Charlesworth is a population geneticist from the UK, notable for her important discoveries in population genetics and evolutionary biology. Her most notable research is in understanding the evolution of recombination, sex chromosomes and mating system for plants.
The XO sex-determination system is a system that some species of insects, arachnids, and mammals use to determine the sex of offspring. In this system, there is only one sex chromosome, referred to as X. Males only have one X chromosome (XO), while females have two (XX). The letter O signifies the lack of a second X. Maternal gametes always contain an X chromosome, so the sex of the animals' offspring depends on whether a sex chromosome is present in the male gamete. Its sperm normally contains either one X chromosome or no sex chromosomes at all.
The ZW sex-determination system is a chromosomal system that determines the sex of offspring in birds, some fish and crustaceans such as the giant river prawn, some insects, the schistosome family of flatworms, and some reptiles, e.g. majority of snakes, lacertid lizards and monitors, including Komodo dragons. It is also present in some plants, where it has probably evolved independently on several occasions. The letters Z and W are used to distinguish this system from the XY sex-determination system. In the ZW system, females have a pair of dissimilar ZW chromosomes, and males have two similar ZZ chromosomes.
A sex chromosome (also referred to as an allosome, heterotypical chromosome, gonosome, heterochromosome, or idiochromosome is a chromosome that differs from an ordinary autosome in form, size, and behavior. The human sex chromosomes, a typical pair of mammal allosomes, carry the genes that determine the sex of an individual created in sexual reproduction. Autosomes differ from allosomes because autosomes appear in pairs whose members have the same form but differ from other pairs in a diploid cell, whereas members of an allosome pair may differ from one another and thereby determine sex.
Temperature-dependent sex determination (TSD) is a type of environmental sex determination in which the temperatures experienced during embryonic/larval development determine the sex of the offspring. It is observed in reptiles and teleost fish, with some reports of it occurring in species of shrimp. TSD differs from the chromosomal sex-determination systems common among vertebrates. It is the most studied type of environmental sex determination (ESD). Some other conditions, e.g. density, pH, and environmental background color, are also observed to alter sex ratio, which could be classified either as temperature-dependent sex determination or temperature-dependent sex differentiation, depending on the involved mechanisms. As sex-determining mechanisms, TSD and genetic sex determination (GSD) should be considered in an equivalent manner, which can lead to reconsidering the status of fish species that are claimed to have TSD when submitted to extreme temperatures instead of the temperature experienced during development in the wild, since changes in sex ratio with temperature variation are ecologically and evolutionally relevant.
An organism's sex is female if it produces the ovum, the type of gamete that fuses with the male gamete during sexual reproduction.
Sexual reproduction is a type of reproduction that involves a complex life cycle in which a gamete with a single set of chromosomes combines with another gamete to produce a zygote that develops into an organism composed of cells with two sets of chromosomes (diploid). This is typical in animals, though the number of chromosome sets and how that number changes in sexual reproduction varies, especially among plants, fungi, and other eukaryotes.
Sarah Perin "Sally" Otto is a theoretical biologist, Canada Research Chair in Theoretical and Experimental Evolution, and is currently a Killam Professor at the University of British Columbia. From 2008-2016, she was the director of the Biodiversity Research Centre at the University of British Columbia. Otto was named a 2011 MacArthur Fellow. In 2015 the American Society of Naturalists gave her the Sewall Wright Award for fundamental contributions to the unification of biology. In 2021, she was awarded the Darwin-Wallace Medal for contributing major advances to the mathematical theory of evolution.
Jennifer Ann Marshall Graves is an Australian geneticist. She is Distinguished Professor within the La Trobe Institute for Molecular Science, La Trobe University, Australia and Professor Emeritus of the Australian National University.
Melissa A. Wilson is an evolutionary and computational biologist and assistant professor at Arizona State University who studies the evolution of sex chromosomes.
Patricia M. Schulte is a Canadian zoologist who is a Professor of Zoology at the University of British Columbia. Her research considers physiology, genomics and population genetics. Schulte is a Fellow of the Royal Society of Canada and the former President of the Canadian Society of Zoologists.
Henry HQ Heng is a professor of molecular medicine and genetics and of pathology at the Wayne State University School of Medicine. Heng first received his PhD from the University of Toronto Hospital for Sick Children in 1994, mentored by Lap-Chee Tsui. He then completed his post-doc under Peter Moens at York University, before joining the Wayne State University School of Medicine faculty.
In this Chinese name, the family name is Long.
References
- 1 2 "Wissenschaftskolleg zu Berlin: Judith Mank, Ph.D." Judith Mank, Ph.D. (in German). Retrieved 2022-09-03.
- ↑ Mank, Judith Elizabeth. "The evolution of reproductive and genomic diversity in ray-finned fishes" . Retrieved 2022-09-07.
- ↑ "Prof. Judith Mank - AcademiaNet". www.academia-net.org. Retrieved 2022-09-03.
- ↑ "The Mank Group". www.ucl.ac.uk. Retrieved 2022-09-03.
- ↑ "The Mank Group". www.zoology.ubc.ca. Retrieved 2022-09-02.
- ↑ Dr. Judith Mank: Genetics of Sex Difference | Researchers Revealed , retrieved 2022-09-03
- ↑ "Fish Species' Y Chromosomes Diverged Even Without Recombination". The Scientist Magazine. Retrieved 2022-09-03.
- ↑ "Judith Mank | Biodiversity Research Centre". biodiversity.ubc.ca. Retrieved 2022-09-03.
- ↑ "Awards". www.amnat.org. Retrieved 2022-09-02.
- ↑ "Society for the Study of Evolution". www.evolutionsociety.org. Retrieved 2022-09-02.
- ↑ "Wissenschaftskolleg zu Berlin: Judith Mank, Ph.D." Judith Mank, Ph.D. Retrieved 2022-09-02.
- ↑ "Judith Mank_Scientific Medal.jpg". Zoological Society of London (ZSL). Retrieved 2022-09-02.
- ↑ "Articles | Biosciences | University of Exeter". biosciences.exeter.ac.uk. Retrieved 2022-09-02.
- ↑ Naylor, David (21 October 2019). "New Honorary Doctors Appointed at Uppsala University - Uppsala University, Sweden". www.uu.se. Retrieved 2022-09-02.
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