Behavior chromosomes sex

By Dr. Saul McLeod , published People often get confused between the terms sex and gender. Sex refers to biological differences between males and females.

Sex chromosome abnormalities like XYY syndrome are some of the most common chromosome abnormalities. As children get older, physical symptoms of XYY syndrome can include: 1 ,2. However, because these characteristics tend to fall within the normal range for males, often those with XYY syndrome do not get diagnosed. Developmental signs of the syndrome may include: 2, 4. Most cases of XYY syndrome are not inherited, and the syndrome occurs randomly in pregnancies of women from all ages and ethnic backgrounds. Two of the 46 chromosomes, known as X and Y, are called sex chromosomes because they help determine whether a person will develop male or female sex characteristics.

Viewpoint: No, the presence of the extra Y chromosome in XYY males does not in and of itself produce aggressive behavior in those affected; dealing with aspects of the condition during adolescence is a more likely explanation for any later social difficulties experienced by XYY males. The debate about the XYY karyotype can be seen as part of the old debate about nature and nurture. The belief that nature, or biological determinism and inheritance, is more important than environment and education was the basis of the field that Francis Galton called "eugenics. Similarly, a tendency to vice, alcoholism, feeble-mindedness, and criminality are inherited.

The XY sex-determination system is a sex-determination system used to classify many mammals , including humans , some insects Drosophila , some snakes, some fish guppies , and some plants Ginkgo tree. In this system, the sex of an individual is determined by a pair of sex chromosomes. Females typically have two of the same kind of sex chromosome XX , and are called the homogametic sex. Males typically have two different kinds of sex chromosomes XY , and are called the heterogametic sex. In humans, the presence of the X chromosome is typically responsible for triggering female development; in the absence of the X chromosome, the fetus will undergo male development.