Klinefelter syndrome (sometimes called Klinefelter's, KS or XXY) is where boys and men are born with an extra X chromosome. Chromosomes are packages of genes found in every cell in the body.

Which parent is responsible for an extra X chromosome?

Determination of parent-of-origin of the extra X chromsome in this sample showed that in 19 subjects the extra X chromosome originated from the mother (maternal group) and in 14 subjects from the father (paternal group).

Can a female have an extra X chromosome?

Triple X syndrome, also called trisomy X or 47,XXX, is characterized by the presence of an additional X chromosome in each of a female's cells. Although females with this condition may be taller than average, this chromosomal change typically causes no unusual physical features.

Do males or females have more X chromosomes?

Each person normally has one pair of sex chromosomes in each cell. Females have two X chromosomes, while males have one X and one Y chromosome. Early in embryonic development in females, one of the two X chromosomes is randomly and permanently inactivated in cells other than egg cells.

Where does the extra X chromosome come from?

In most cases, either the mother's egg cell or the father's sperm cell divides incorrectly, resulting in an extra X chromosome in the child. This random error is called nondisjunction, and all the cells in the child's body will have the extra X chromosome.

Secrets of the X chromosome - Robin Ball

23 related questions found

What is Jacob syndrome?

Jacobs syndrome, also known as 47,XYY syndrome, is a rare genetic condition that occurs in about 1 out of 1000 male children. It belongs to a group of conditions known as "sex chromosome trisomies", with Klinefelter's syndrome being the more common type. This condition was initially discovered in the 1960s.

What is the karyotype for Turners syndrome?

Turner syndrome is associated with a 45,X karyotype, with a single X chromosome. Mosaicism is not uncommon, however, with a separate cell line containing either a normal 46,XX or XY karyotype, or 46 chromosomes including a structurally rearranged X or Y.

What happens if you have 47 chromosomes?

Humans have 23 pairs of chromosomes. A trisomy is a chromosomal condition characterised by an additional chromosome. A person with a trisomy has 47 chromosomes instead of 46. Down syndrome, Edward syndrome and Patau syndrome are the most common forms of trisomy.

CAN XXY have babies?

It is possible that an XXY male could get a woman pregnant naturally. Although sperm are found in more than 50% of men with KS³, low sperm production could make conception very difficult.

Can you be born with an extra Y chromosome?

XYY syndrome is a genetic condition that occurs when a male is born with an extra Y chromosome. Instead of having one X and one Y sex chromosome, those with XYY syndrome have one X and two Y chromosomes.

Which parent causes Klinefelter syndrome?

Klinefelter syndrome is not caused by anything the parents did or did not do. The disorder is a random error in cell division that happens when a parent's reproductive cells are being formed.

Does Adele have Klinefelter syndrome?

Adele Markham has a rare genetic disorder called Klinefelters, which means she is not male or female, but both – known as intersex. Born as Matthew, her parents were delighted to be told they had a son, after having two older girls.

What determines if you are a boy or girl?

Biological sex in healthy humans is determined by the presence of the sex chromosomes in the genetic code: two X chromosomes (XX) makes a girl, whereas an X and a Y chromosome (XY) makes a boy.

Can you have 48 chromosomes?

Boys and men with 48,XXXY syndrome have the usual single Y chromosome, but they have three copies of the X chromosome, for a total of 48 chromosomes in each cell. Boys and men with 48,XXXY syndrome have extra copies of multiple genes on the X chromosome.

Does an extra Y chromosome make you a killer?

The court found that while an extra Y chromosome seems like a logical explanation for mutant-aggressive behaviour, there is not much evidence that links the X or Y chromosome to the deviant behaviour of serial killers.

Why is it called Superman Syndrome?

The term 'superman' refers to the presence of the additional male-defining Y chromosome and affects approximately 1 in every 850 males.

What is the phenotype of Turner syndrome?

Turner's syndrome, or monosomy X, is defined as the total or partial loss of the second sex chromosome. The clinical phenotype is highly variable and includes short stature, gonadal dysgenesis, pterygium colli, cubitus valgus and low hairline.

What is Mosaic Turner Syndrome?

Mosaic Turner syndrome (TS) is a condition in which cells inside the same person have different chromosome packages. Mosaic TS can affect any cell in the body. Some cells have X chromosomes and some don't. Every 3 out of every 10 girls with TS will have some form of Mosaic TS.

What are giemsa bands?

Giemsa banding or G-banding is a banding technique that cytogeneticists employ in order to produce a banding pattern in individual chromosome. Cytogeneticists use banding techniques to determine the characteristic pattern of light and dark bands on a chromosome under a microscope.

What is yy chromosome gender?

Sometimes, this mutation is only present in some cells. Males with XYY syndrome have 47 chromosomes because of the extra Y chromosome. This condition is also sometimes called Jacob's syndrome, XYY karyotype, or YY syndrome.

What is Metafemale syndrome?

Triple-X syndrome occurs in women who inherit three X chromosomes--their genotype is XXX or more rarely XXXX or XXXXX. As adults, these "super-females" or "metafemales" , as they are sometimes known, generally are an inch or so taller than average with unusually long legs and slender torsos but otherwise appear normal.

What is Cri du Chat Syndrome?

Cri du chat syndrome is a rare genetic disorder caused by missing pieces on a particular chromosome. It is not the result of anything the parents have done or failed to do. The characteristics of a newborn with cri du chat syndrome include a high-pitched cry, a small head and a flattened bridge of the nose.

Is it easier to have a girl or boy?

But that's not exactly true – there's actually a slight bias toward male births. The ratio of male to female births, called the sex ratio, is about 105 to 100, according to the World Health Organization (WHO). This means about 51% of deliveries result in a baby boy.

Is there a way to guarantee a boy?

As to whether there's a guaranteed way to influence your chances have a boy — no, there isn't. Short of medically implanting an embryo that is known to be a boy, there are no guarantees when it comes to the sex of your baby.

Which side of uterus is baby girl?

According to the theory, the placement of your developing placenta – which must be determined in a very precise way – can reveal your baby's sex. If your placenta is forming on the right side of your uterus, the baby is most likely a boy, the theory claims. If it's forming on the left side, it's probably a girl.