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Genetics Sex
Linked Inheritance
There are some inheritance of traits that are liked to sex chromosomes. Sex of an individual is determined by a single pair of chromosomes - XY chromosomes.
Each egg produced by the female contains one X chromosome, but the sperm produced by the male can contain either an X or a Y chromosome. The union of an egg, which always bears an X chromosome, with a sperm also bearing an X chromosome produces a female offspring -- carrying XX chromosomes. The union of an egg with a sperm that bears a Y chromosome produces a male offspring -- carrying XY chromosomes. The human Y chromosome is approximately one-third as long as the X, and apart from its role in determining maleness, it appears to be genetically inactive. Most genes on the X have no counterpart on the Y. Diseases passed on as sex linked inheritance are Hemophilia, red-green color blindness, hereditary nearsightedness, night blindness, and ichthyosis. Other abnormalities due to Sex Chromosome are --
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