Is XYY Syndrome a Mutation? Help?
Question by Lovey: Is XYY syndrome a mutation? Help?
What kind? And what causes it? I have looked all over and i can’t find any info.
Best answer:
Answer by ?????? ? ????????????? ?????????
its considered an addition – which is somethng not normal thus a mutation in the sex chromosome (in the Gene Level)
People normally have 46 chromosomes in each cell. 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. Females typically have two X chromosomes (46,XX), and males have one X chromosome and one Y chromosome (46,XY).
47,XYY syndrome is caused by the presence of an extra copy of the Y chromosome in each of a male’s cells. As a result of the extra Y chromosome, each cell has a total of 47 chromosomes instead of the usual 46. It is unclear why an extra copy of the Y chromosome is associated with tall stature, learning problems, and other features in some boys and men.
Some males with 47,XYY syndrome have an extra Y chromosome in only some of their cells. This phenomenon is called 46,XY/47,XYY mosaicism.
47,XYY syndrome is associated with an increased risk of learning disabilities and delayed development of speech and language skills. Delayed development of motor skills (such as sitting and walking), weak muscle tone (hypotonia), hand tremors or other involuntary movements (motor tics), and behavioral and emotional difficulties are also possible. These characteristics vary widely among affected boys and men.
A small percentage of males with 47,XYY syndrome are diagnosed with autistic spectrum disorders, which are developmental conditions that affect communication and social interaction.
Most cases of 47,XYY syndrome are not inherited
The error that causes the extra Y chromosome can occur in the fertilizing sperm or in the developing embryo maybe due to exposure to X-rays.
Answer by Boomer Rat
XYY syndrome is “an aneuploidy (abnormal number) of the sex chromosomes in which a human male receives an extra Y chromosome, giving a total of 47 chromosomes instead of the more usual 46.”
It is a mutation of a kind – it’s an extra chromosome. These things sometimes happen for no reason at all.
“XYY is not inherited, but usually occurs as a random event during the formation of sperm cells. An error in chromosome separation during anaphase II (of meiosis II) called nondisjunction can result in sperm cells with an extra copy of the Y chromosome. If one of these atypical sperm cells contributes to the genetic makeup of a child, the child will have an extra Y chromosome in each of the body’s cells”
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