Allosome - Wikipedia
An allosome (also referred to as a sex chromosome, heterotypical chromosome, heterochromosome, or idiochromosome) is a chromosome that differs from an ordinary autosome in form, size, and behavior. The human sex chromosomes, a typical pair of mammal allosomes, determine the sex of an individual created in sexual reproduction.Autosomes differ from allosomes because autosomes appear in pairs ...
Sex-determination system - Wikipedia
The XX/XY sex-determination system is the most familiar, as it is found in humans. The XX/XY system is found in most other mammals, as well as some insects.In this system, most females have two of the same kind of sex chromosome (XX), while most males have two distinct sex chromosomes (XY).
Sex Chromosomes and Sex Chromosome Abnormalities
Sex Chromosomes and Sex Chromosome Abnormalities Xu Li, MD, PhD KEYWORDS • Sex chromosome • Sex chromosome abnormalities • X-inactivation • Mosaicism • X-linked mental retardation
INTRODUCTION. Sex chromosome abnormalities are due to numeric abnormalities (eg, aneuploidies such as monosomy X) or structural defects (eg, isochromosome Xq leading to Turner syndrome) involving the X and Y chromosomes.
WHO | Gender and Genetics
Humans are born with 46 chromosomes in 23 pairs. The X and Y chromosomes determine a person’s sex. Most women are 46XX and most men are 46XY. Research suggests, however, that in a few births per thousand some individuals will be born with a single sex chromosome (45X or 45Y) (sex monosomies) and ...
The End of Men? Male Sex Chromosome Is Slowly Disappearing
If the same rate of degeneration continues, the Y chromosome has just 4.6 million years left before it disappears completely.
Klinefelter Syndrome Support Group website
Website for Klinefelter Syndrome support. DISCLAIMER The information, text, graphics, and links provided on this site are provided
The Biology behind Red-Green Color Blindness | Colblindor
Red-green color blindness is in the majority of cases provoked through a defective X-chromosome. Human beings have 23 different pairs of chromosomes whereof one pair is the so called sex-chromosome. This pair consists of two X-chromosomes on women and one X- coupled with one Y-chromosome on men ...
030 - Advanced Genetic — bozemanscience
Paul Andersen explains important concepts that can not be explained by simple Mendelian genetics. He begins with a discussion of polygenic inheritance and uses a simulation on height to show how a bell shape curve of phenotypes is produced.
Sex Chromosome Abnormalities: Klinefelter's Syndrome ...
Why are sex chromosome abnormalities so much more common than other chromosome abnormalities? Why can you live without a Y chromosome but not without an X chromosome? Does having an extra Y chromosome mean you can't be found guilty of murder? Tim Wogan explores the science of sex chromosome disorders and finds out what distinguishes an XXY from an XYY.