who is julia louis dreyfus dating Xxx social adult webcam sex random

In humans, X-chromosome inactivation enables males and females to have equal expression of the genes on the X-chromosome since females have two X-chromosomes while males have a single X and a Y chromosome.

X-chromosome inactivation is random in the somatic cells of the body as either the maternal or paternal X-chromosome can become inactivated in each cell. This process is seen in all mammals and is also referred to as lyonisation —after the geneticist Mary F. In the somatic cells of a developing female child, one of the X-chromosomes is shortened and condensed.

Sex differences in human physiology are distinctions of physiological characteristics associated with either male or female humans.

These can be of several types, including direct and indirect.

Although sex is a binary dichotomy, with "male" and "female" representing opposite and complementary sex categories for the purpose of reproduction, a small number of individuals have an anatomy that does not conform to either male or female standards, or contains features closely associated with both.

Such individuals, described as intersexuals, are sometimes infertile but are often capable of reproducing.

One set of 23 comes from the mother and one set comes from the father.

Of these 23 pairs of chromosomes, 22 are autosomes, and one is a sex chromosome.Indirect sex differences are general differences as quantified by empirical data and statistical analysis.Most differing characteristics will conform to a bell-curve (i.e.The current estimated rate for intersexuality is about 1 in 1500 to 1 in 2000 births.There are a greater number of individuals, however, who have a subtler variation of their assigned sex. its rib cage is more rounded and smaller, its lumbar curve greater, and a generally longer and smaller female waist results from the chest being more narrow at the base, and the pelvis generally not as high.If an egg fuses with a sperm with a Y chromosome, the resulting individual is male.