which of the following is caused by a gene on the x chromosome?
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X chromosome Klinefelter syndrome: 1  Klinefelter syndrome is caused by the presence of one or more extra copies of the X chromosome in a male's cells. 2  Males with Klinefelter syndrome typically have one extra copy of the X chromosome in each cell, for a total of two X chromosomes and one Y chromosome (47,XXY).
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- Some cells have the usual two sex chromosomes (either two X chromosomes or one X chromosome and one Y chromosome), and other cells have only one copy of the X chromosome. Women with Turner syndrome caused by X chromosome mosaicism (45,X/46,XX or 45,X/46,XY) are said to have mosaic Turner syndrome.
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Learn About Sex-Linked Traits and Disorders Hemophilia is an X-linked recessive trait caused by a gene mutation. It is more often seen in men than women. The image above depicts the inheritance pattern of the hemophilia trait when the mother is a carrier and the father does not have the trait.
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How Chromosomes Determine Sex Genes located on the X chromosome are called X-linked genes and these genes determine X sex-linked traits. A mutation occurring in one of these genes could lead to the development of an altered trait.
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- A defect in one of the genes that determines how the body makes blood clotting factor VIII or IX causes hemophilia. These genes are located on the X chromosomes (KRO-muh-somz). Chromosomes come in pairs. Females have two X chromosomes, while males have one X and one Y chromosome. Only the X chromosome carries the genes related to clotting factors. A male who has a hemophilia gene on his X chromosome will have hemophilia. When a female has a hemophilia gene on only one of her X chromosomes, she is a hemophilia carrier” and can pass the gene to her children. Sometimes carriers have low levels of clotting factor and have symptoms of hemophilia, including bleeding.
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fragile X syndrome Fragile X syndrome is caused by a mutation that prevents the Fragile X mental retardation (Fmr-1) gene from being transcribed. This gene is located on the X chromosome (the se … x chromosome). Since males only carry one of these chromosomes, they are twice as likely to be affected by the mutation than females.
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X-linked recessive inheritance X-linked recessive inheritance is a mode of inheritance in which a mutation in a gene on the X chromosome causes the phenotype to be expressed in males (who are necessarily hemizygous for the gene mutation because they have one X and one Y chromosome) and in females who are homozygous for the gene mutation, see zygosity.
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Xeroderma pigmentosum Since DNA repair is under genetic control, it can easily undergo mutations. Many genetic disorders such as xeroderma pigmentosum (XP; MIM 278700) are caused by mutations in genes that repair DNA. If the gene was not repaired correctly it could cause xeroderma pigmentosum in individuals.The autosomal recessive disorder xeroderma pigmentosum or XP has a frequency of 1 in every 250,000 individuals of all races and ethnic groups.f the gene was not repaired correctly it could cause xeroderma pigmentosum in individuals. The autosomal recessive disorder xeroderma pigmentosum or XP has a frequency of 1 in every 250,000 individuals of all races and ethnic groups.
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- xeroderma pigmentosum-caused by mutations in the XPA gene. At least 25 mutations in the XPA gene have been found to cause xeroderma pigmentosum. Mutations in this gene are responsible for a very severe form of the disorder that is more common in the Japanese population than in other populations.he neurological abnormalities are thought to result from a buildup of DNA damage, although the brain is not exposed to UV rays. Researchers suspect that other factors damage DNA in nerve cells. It is unclear why some people with xeroderma pigmentosum develop neurological abnormalities and others do not.
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Human genetics Just like X-linked inheritance, there will be a lack of male-to-male inheritance, which makes it distinguishable from autosomal traits. One example of a X-linked trait is Coffin-Lowry syndrome, which is caused by a mutation in ribosomal protein gene.
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Fragile X Syndrome Fragile X syndrome is caused by an abnormality (mutation) in the FMR1 gene. Affected individuals have an increased number of copies of a portion of the gene called CGG repeats. The greater the number of copies of CGG, the more likely there will be increased severity of the disorder.
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Fragile X Syndrome Fragile X syndrome is caused due to mutation in a gene known as ‘FMR1’. Repetition of a tiny portion of the gene code on a fragile area of the X chromosome creates this problem. The level of repetition determines the severity of the syndrome. 1  The FMR1 gene produces a protein required for proper growth of the brain.
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Information for Women Hemophilia is caused by a problem in one of the genes that tells the body to make the clotting factors needed to form a blood clot. These genes are located on the X chromosome. All males have one X and one Y chromosome (XY) and all females have two X chromosomes (XX).
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Human Genetics Problem Set Klinefelter's syndrome. Klinefelter's syndrome, XXY males, can occur due to nondisjunction of X chromosomes during prophase of meiosis I in females. One of the eggs from such a meiosis could receive both X chromosomes, and the other would receive no X chromosomes.
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How Fragile X Syndrome is Inherited FXS is caused by a change in the fragile X mental retardation 1 (FMR1) gene. The FMR1 gene makes a protein called fragile X mental retardation protein (FMRP) that is needed for normal brain development. Genes are found on chromosomes.
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Causes 1 classic Turner syndrome – where one of the X chromosomes is completely missing. 2  mosaic Turner syndrome – in most cells one X chromosome is complete and the other is partially missing or abnormal in some way, but in some cells there may be just one X chromosome or, rarely, two complete X chromosomes.
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Definition of ya Slang terms with the same meaning. Definitions include: statement of agreement. Definitions include: an emphatic yes. Definitions include: the tortured artist half of a pair of people. Definitions include: equivalent to I already know or You already know, as if to say YES! emphatically.
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Rett Syndrome in Boys They are the chromosomes that determine gender, or sex chromosomes as they are often referred. Females have two X chromosomes, while males have an X and a Y chromosome. These chromosomes play a huge role in Rett Syndrome. Rett Syndrome is caused by a genetic mutation in one X chromosome. A gene known as MECP2 (pronounced meck-pee-two) found on the X chromosome, not only supplies essential MeCP2 proteins to the brain necessary for proper development, but also regulates other genes.
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- The condition is caused by a defect in one of the clotting factor genes that lies on the X chromosome. Hemophilia almost always occurs in males since the gene can be passed from mother to son, and a son lacks a second X chromosome to make up for the defective gene. Girls, on the other hand, are likely to be carriers of hemophilia but unlikely to actually have the disorder.
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What causes Down syndrome? ​​​. Down syndrome is caused by a random error in cell division that results in the presence of an extra copy of chromosome 21. The type of error is called nondisjunction (pronounced non-dis-JUHNGK-shuhn).
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Fragile X syndrome Location of FMR1 gene on the X chromosome. Fragile X syndrome is a genetic disorder which occurs as a result of a mutation of the fragile X mental retardation 1 (FMR1) gene on the X chromosome, most commonly an increase in the number of CGG trinucleotide repeats in the 5' untranslated region of FMR1.
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Genetic disorder X-linked recessive disorders are also caused by mutations in genes on the X chromosome. Males are more frequently affected than females, and the chance of passing on the disorder differs between men (illustration) and women (illustration).-linked recessive disorders are also caused by mutations in genes on the X chromosome. Males are more frequently affected than females, and the chance of passing on the disorder differs between men (illustration) and women (illustration).
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Overview Any one of three genetic variations can cause Down syndrome: Trisomy 21. About 95 percent of the time, Down syndrome is caused by trisomy 21 — the person has three copies of chromosome 21, instead of the usual two copies, in all cells. This is caused by abnormal cell division during the development of the sperm cell or the egg cell. Mosaic Down syndrome.
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Y chromosome Turner syndrome is related to the X chromosome, which is one of the two sex chromosomes. People typically have two sex chromosomes in each cell: females have two X chromosomes, while males have one X chromosome and one Y chromosome.Turner syndrome results when one normal X chromosome is present in a female's cells and the other sex chromosome is missing or structurally altered.ome women with Turner syndrome have a chromosomal change in only some of their cells, which is known as mosaicism. Women with Turner syndrome caused by X chromosome mosaicism are said to have mosaic Turner syndrome.
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Learning About Turner Syndrome Turner syndrome is a chromosomal condition related to the X chromosome. Researchers have not yet determined which genes on the X chromosome are responsible for most signs and symptoms of Turner syndrome.Turner syndrome facts by John P. Cunha, DO, FACOEP. 1  Turner syndrome is a chromosomal condition related to the X chromosome that alters development in females, though it is not usually inherited in families. 2  Symptoms of Turner syndrome are:
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fragile X syndrome It is the most common form of inherited mental retardation. Fragile X syndrome is caused by a mutation in the FMR-1 gene, located on the X chromosome. The role of the gene is unclear, but it is probably important in early development.
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- Turner syndrome only occurs in girls and women. Females normally have two X chromosomes. Chromosomes are hereditary material in each cell of the body, that determine characteristics like gender and height. Turner syndrome is most commonly caused by a missing X chromosome. It affects 1 out of 2,000 live female births.