Sexual dimorphism

Sex: Strict dimorphism or sexual multiplicity The discussion of genes and gender and the respective roles they play in determining sex and identity have been widely discussed in recent decades. The idea that biology can solely determine ones sex, wherein no external factors impact that determination requires further discussion. The topic of whether there are strictly two distinct genders represented in society has been recognized largely as a western cultural viewpoint. While not everyone agrees

2.2.1.The Skull It has been shown that the skull has the second greatest degree of sexual dimorphism with reported accuracies for sex determination as high as 77% (Stewart, 1979), 80-90% (Hanihara, 1959; Krogman, 1962; Cox and Mays, 2000) and even >95% (Baughan and Demirjian, 1978; Briggs, 1998; Franklin, Freedman and Milne, 2005; Kimmerle, Ross and Slice, 2008). However, it is thought that novice forensic anthropologists might report lower accuracies than these since, for example Stewart (1979)

anisogamous species, humans have sexually dimorphic traits of both morphological and behavioural kinds. Such traits are said to have evolved through sexual selection, the limiting force allowing individuals to out-reproduce others. At the level of gametes, we expect asymmetries in reproductive effort and in reproductive potential, which yields sexual dimorphism. According to Triversian Parental Investment Theory (PIT), the sex of a species who provides higher post-zygotic investment, typically the female

Introduction The analysis of sexual dimorphism is a major component to understanding human variation. Sexual dimorphism can be defined as the morphological, genetic, and hormonal differences that allow for distinction between the male and female sexes. The degree to which these traits manifest varies between and within population groups. Most commonly observed traits of sexual dimorphism are portrayed through major and secondary sexual organs, which are composed of soft tissues. In bioarchaeological

Sexual dimorphism is any difference, morphological or behavioral, between males and females of the same species. Sexual dimorphism can include differences in weaponry, ornamentation, size, vocalization, chemical signal, gametes, behavior, and parental care. It is seen in exaggerated forms in the birds of paradise, though it is present in many other species as well. In mammals one way sexes are sexual dimorphic is in their size. In many mammalian species the males are larger than the females this

of human remains, as the number of potential matches is halved, (Loth and Iscan, 2000) as cited by Bidmos et al., 2010. Other characteristics, such as age, are dependent on knowing the sex of the individual, (Bidmos et al., 2010). Therefore, sexual dimorphism, which is the differences between males and females due to intrinsic factors (hormones) and extrinsic factors (the environment), provides variation between male and female skeletal material. These differences allow for easier reconstruction of

Gorilla beringei beringei, more commonly known as the Mountain Gorilla, is one of the most sexually dimorphic species of primates in existence. Sexual dimorphism is a phenotypic difference between males and females of the same species. The prototypical example is for differences in reproductive organs, but sexual dimorphism can affect many different characteristics. In mallard ducks for example, the male’s feathers are colored bright green, on its head in order to help attract the brown headed females

When attempting to explain something as intangible and complex as human behavior it is difficult to devise experiments that lead to conclusive results. Sometimes complex problems are easier to solve when they are broken down into smaller pieces or into simpler problems that are more approachable. Using human evolution to explain human behavior is such an example. Evolutionary psychology reaches for the roots of human development when they were in their most basic stages to explain why people behave

Success of male yellow dung fly breeding. Introduction Looking at the yellow dung fly, Scathophaga stercoraria, it is seen that the species experiences sexual dimorphism in the form of both size and colour. This gives changes between the males and females that are specially adapted to give them the best chance of producing offspring. Males are considerably larger than the females and have clearly defining yellow hair along the abdomen, whereas females are smaller and are more of an olive green colour

An investigation into whether a larger head and rear limb size in the Tenerife Lizard Gallotia galloti and whether this indicates anything about the mating behaviours for the species. Introduction. Tenerife is the largest of the Canary Islands, it is one of the western islands and is therefore more humid then the eastern islands. It is comprised of two ancient regions (Anaga and Teno) which collided two million years ago, forming the island of Tenerife (Thorpe & Baez, 1987.) The Gallotia galloti