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In humans, barring intersex conditions causing aneuploidy and other unusual states, it is the male that is heterogametic, with XY sex chromosomes.. Haldane's rule is an observation about the early stage of speciation, formulated in 1922 by the British evolutionary biologist J. B. S. Haldane, that states that if — in a species hybrid — only one sex is inviable or sterile, that sex is more ...
The Cambridge Dictionary of Sociology is a dictionary of sociological terms published by Cambridge University Press and edited by Bryan S. Turner. There has only been one edition so far. The Board of Editorial Advisors is made up of: Bryan S. Turner, Ira Cohen, Jeff Manza, Gianfranco Poggi, Beth Schneider, Susan Silbey, and Carol Smart. In ...
Homozygous and heterozygous. Zygosity (the noun, zygote, is from the Greek zygotos "yoked," from zygon "yoke") (/ z aɪ ˈ ɡ ɒ s ɪ t i /) is the degree to which both copies of a chromosome or gene have the same genetic sequence. In other words, it is the degree of similarity of the alleles in an organism.
This category relates to specifically sociological terms and concepts. Wider societal terms that do not have a specific sociological nature about them should be added to social concepts in keeping with the WikiProject Sociology scope for the subject.
Females possessing one X-linked recessive mutation are considered carriers and will generally not manifest clinical symptoms of the disorder, although differences in X chromosome inactivation can lead to varying degrees of clinical expression in carrier females since some cells will express one X allele and some will express the other. All ...
This is called facultative parthenogenesis (other terms are cyclical parthenogenesis, heterogamy [14] [15] or heterogony [16] [17]). The switch between sexuality and parthenogenesis in such species may be triggered by the season ( aphid , some gall wasps ), or by a lack of males or by conditions that favour rapid population growth ( rotifers ...
According to this model, if an individual is heterozygous for a certain locus, it develops into a female, whereas hemizygous and homozygous individuals develop into males. In other words, diploid offspring develop from fertilized eggs, and are normally female, while haploid offspring develop into males from unfertilized eggs.
In birds and some reptiles, by contrast, it is the female which is heterozygous and carries a Z and a W chromosome while the male carries two Z chromosomes. In mammals, females can have XXX or X. [30] [31] Mammalian females bear live young, with the exception of monotreme females, which lay eggs. [32]