The human genome is made up of a total of 23 chromosomes: 22 autosomes, which occur in matched pairs, and 1 set of sex chromosomes. Sex chromosomes determine your gender and can be matching or not. Women get two copies of the X-chromosome, but men get one copy of the X-chromosome and one copy of the Y-chromosome. When a baby is born with more than two sex chromosomes, it has one of three syndromes.
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Klinefelter’s Syndrome: XXY Males
XY sex-determination system - Wikipedia
Men should not smoke, drink or take unnecessary drugs if they are planning to become fathers to avoid causing health problems for their children, a health expert has warned. Scientists found that toxic chemicals can damage sperm, which then pass altered genes onto babies. In experiments on rats Matthew Anway of the University of Idaho found that some garden chemicals caused problems such as damaged and overgrown prostates, infertility and kidney problems, all of which were present up to four generations later. Cynthia Daniels, of Rutgers University in New Jersey, an expert in the relation between a father and child's health, said: "If I was a young man I would not drink beer, I would not be smoking when I'm trying to conceive a child. It is well known that a mother's health is critically important in the resulting health of her baby, but there is now a growing body of evidence from both animal and human studies that paternal exposure to toxins can also adversely effect the development of a foetus, and that this can be passed down the generations. Daniels, who led a seminar at the American Association for the Advancement of Science annual meeting in Boston, said: "Historically it has been assumed that exposures to the male will not affect his ability to pass defects on to children.
Is Penis Size Genetic?
A Newcastle University study involving thousands of families is helping prospective parents work out whether they are likely to have sons or daughters. The work by Corry Gellatly, a research scientist at the university, has shown that men inherit a tendency to have more sons or more daughters from their parents. This means that a man with many brothers is more likely to have sons, while a man with many sisters is more likely to have daughters.
The Y chromosome is one of two sex chromosomes allosomes in therian mammals , including humans , and many other animals. The other is the X chromosome. Y is normally the sex-determining chromosome in many species , since it is the presence or absence of Y that typically determines the male or female sex of offspring produced in sexual reproduction.