Sex Chromosomes
In humans, the sex of an individual is determined by the type of sex chromosomes a person has. Most men have an X chromosome from their mother and a Y chromosome from their father. Most women receive an X chromosome from their mother and an X chromosome from their father. There are exceptions to this rule, such as an XO woman (Turner's syndrome), who receives only a single X from one of her parents and fails to receive a second X because of nondisjunction in her parent's sex chromosomes during meiosis. This might occur, for example, when in egg formation the mother's XX chromosomes fail to separate, resulting in one gamete receiving two X chromosomes and another gamete receiving no X chromosome. If a sperm fertilizes the egg that has no X chromosome, then the resulting zygote becomes an XO girl. Turner's syndrome affects about 1 out of every 3,000 female births. These females are characterized by having skin flaps on the back of their necks, and are sterile.
On the other hand, if......
View the rest of this paper...
Approximate Word Count: 855
Approximate Pages: 4 (250 words per double-spaced page)
Why should you join Frat Files?
- - It's safe, secure, and private.
- - Instant access to over 100,000 papers. New papers are added hourly.
- - Fast and reliable customer support.
Similar Essays
-
Sex Chromosomes
Sex Chromosomes. In humans, the sex of an individual is determined by the
type of sex chromosomes a person has. Most men have an ... -
Inheritance
... The traits or alleles appear on either Sex Chromosomes or Autosomal Chromosomes. ...
An autosomal trait can be located on any chromosome but the sex chromosomes. ... -
Hemophilia
... present. Females have two X chromosomes for their sex chromosomes. They ... offspring.
Males have X and Y chromosomes for their sex chromosomes. They ... -
Fragile X Syndrome
Fragile X Syndrome. The chromosomes on a normal person are 23 pairs and the sex
chromosomes. For males it is XY for sex chromosomes and females is XX. ... -
Human Genetic Disorders
... chromosome pairs (trisomy) or only one chromosome of a normal pair (monosomy) ?
Involves any chromosomes, including the sex chromosomes ? Causes serious ...
Frat Files
Members
Information
