testes determining factor

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• Testis determining factor — (TDF) is a general term for the gene (or product thereof) that results in maleness in humans and some other species. Certain genes cause chemical reactions that result in the development of testes. Embryos are gonadally identical, regardless of… …   Wikipedia

• Testes — Der Hoden [ˈhoːdn̩] oder (seltener) der/die Hode [ˈhoːdə] (v. mittelhochdt.: hode, v. althochdt.: hodo, v. idg.: *skeu(t) „bedecken, verhüllen“) oder der Testikel (v. lat.: testiculus, Vkl. von testis Zeuge [der Virilität], Hode, Plural:… …   Deutsch Wikipedia

• factor — 1. One of the contributing causes in any action. 2. One of the components that by multiplication makes up a number or expression. 3. SYN: gene. 4. A vitamin or other essential element. 5. An event, characteristic, or other definable entity that …   Medical dictionary

• Железы и поведение (glands and behavior) — Железы можно разделить на два класса: экзокринные (внешней секреции) и эндокринные (внутренней секреции). Экзокринные железы имеют протоки. Их продукты выполняют свои функции в окрестностях выделяющей секрет железы, но вне тканей тела, хотя это… …   Психологическая энциклопедия

• XY sex-determination system — Drosophila sex chromosomes The XY sex determination system is the sex determination system found in humans, most other mammals, some insects (Drosophila) and some plants (Ginkgo). In this system, females have two of the same kind of sex… …   Wikipedia

• sex — /seks/, n. 1. either the male or female division of a species, esp. as differentiated with reference to the reproductive functions. 2. the sum of the structural and functional differences by which the male and female are distinguished, or the… …   Universalium

• Sex determination and differentiation (human) — Human sex determination refers to the processes by which an individual becomes either a male or female during development.The Jost ParadigmUnder typical circumstances, the sex of an individual will be determined and expressed through the… …   Wikipedia

• Sex organ — Flowers are the sex organs of flowering plants. A sex organ, or primary sexual characteristic, as narrowly defined, is any of the anatomical parts of the body which are involved in sexual reproduction and constitute the reproductive system in a… …   Wikipedia

• Gonad — The gonad is the organ that makes gametes. The gonads in males are the testes and the gonads in females are the ovaries. The product, gametes, are haploid germ cells. For example, spermatozoon and egg cells are gametes. Although medically the… …   Wikipedia

• Human genetics — describes the study of inheritance as it occurs in human beings. Human genetics encompasses a variety of overlapping fields including: classical genetics, cytogenetics, molecular genetics, biochemical genetics, genomics, population genetics,… …   Wikipedia

• endocrine system, human — ▪ anatomy Introduction  group of ductless glands (gland) that regulate body processes by secreting chemical substances called hormones (hormone). Hormones act on nearby tissues or are carried in the bloodstream to act on specific target organs… …   Universalium