sex-ratio factor

sex-ratio factor
фактор соотношения полов
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SR-фактор
фактор соотношения полов

English-russian biological dictionary. 2013.

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  • Human sex ratio — In anthropology and demography, the human sex ratio is the sex ratio for Homo sapiens (i.e. the ratio of males to females in a population). Like most sexual species, the sex ratio is approximately 1:1. In humans the secondary sex ratio (i.e. at… …   Wikipedia

  • Sex allocation — is the allocation of resources to male versus female reproduction in sexual species (Charnov 1982). Sex allocation depends upon the breeding system of a species, as well as how reproduction is carried out within each breeding system. Breeding… …   Wikipedia

  • Child sex ratio — In India, the child sex ratio is the number of females per thousand males in a human population in the age group 0–6 years.[1]. It is equal to the multiplicative inverse of the sex ratio (ratio of males to females in a population) under age seven …   Wikipedia

  • Sex-selective abortion and infanticide — Sex selective abortion is the targeted abortion of a fetus based upon its sex. This is done after a determination is made (usually by ultrasound but also rarely by amniocentesis or another procedure) that the fetus is of an undesired sex. Sex… …   Wikipedia

  • Sex-selective abortion — is the practice of terminating a pregnancy based upon the predicted sex of the baby. The selective abortion of female fetuses is most common in areas where cultural norms value male children over female children,[1] especially in parts of People… …   Wikipedia

  • Sex differences in humans — Male and female anatomy. Note that these models have had body hair and male facial hair removed and head hair trimmed. A sex difference is a distinction of biological and/or physiological characteristics associated with either males or females of …   Wikipedia

  • Sex and intelligence — research investigates differences in the distributions of cognitive skills between men and women. This research employs experimental tests of cognitive ability, which take a variety of forms. Research focuses on differences in individual skills… …   Wikipedia

  • Sex hormone-binding globulin — (SHBG) is a glycoprotein that binds to sex hormones, specifically testosterone and estradiol. Other steroid hormones such as progesterone, cortisol, and other corticosteroids are bound by transcortin. Transport of sex hormonesThese sex hormones… …   Wikipedia

  • Sex and psychology — This article is about psychology and the male and female biological sexes. For information about human sexual perceptions, see Human sexuality. Research on sex and psychology investigates cognitive and behavioral differences between men and women …   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

  • Temperature-dependent sex determination — (TSD), also called environmental sex determination [http://www.nature.com/nature/journal/vaop/ncurrent/abs/nature06519.html The adaptive significance of temperature dependent sex determination in a reptile] from Nature ] , is where the… …   Wikipedia


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