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What common condition is caused by the presence of three copies is chromosomes 21?
Down syndrome
What does the karyotype of a person with down syndrome show?
A genetic disorder caused by the presence of all or part of a third copy of chromosome 21.
What is translocation downs syndrone?
Translocation Down syndrome is a genetic condition caused by the presence of an extra chromosome 21 due to a rearrangement of genetic material between chromosomes. Unlike the more common forms of Down syndrome, which result from an extra full chromosome 21, translocation Down syndrome occurs when a portion of chromosome 21 becomes attached to another chromosome. This can happen during the formation of reproductive cells or in early fetal development. Individuals with translocation Down syndrome typically exhibit the same physical and cognitive characteristics associated with Down syndrome.
What is the genetic disorder associated with chromosome 5 monosomy?
The most common condition associated with a deletion of the end of chromosome 5 is: cri-du-chat syndrome.
Which hypothyroid condition is thought to be caused by autoimmune factors?
Hashimoto's disease is the most common hypothyroid condition caused by autoimmune factors.
What common condition is caused by the presence of three copies of chromosome 21?
Most cases of Down syndrome result from trisomy 21, which means each cell in the body has three copies of chromosome 21 instead of the usual two copies. The extra genetic material disrupts the normal course of development, causing the characteristic features of Down syndrome.Hope this helps.
Is Down syndrome caused by a recessive gene?
Down syndrome is caused by a third copy on chromosome 21 and is present at conception or shortly after. It is mostly a random (and relatively common) occurrence, unless it is of the translocation type which is rare and genetic.
What is kliefelters syndrome?
Klinefelter syndrome is a genetic condition that results when a boy is born with an extra copy of the X chromosome. Klinefelter syndrome is a common genetic condition affecting males.
What does it mean when someone has an extra chromosome?
If someone has an extra chromosome it means there was a genetic mutation that is abnormal in human development. It may result in problems with the person affecting them on a basic level, or may go fully unnoticed. A common disorder that can be caused by having an extra chromosome is Down's Syndrome.
Is edwards syndrome more common in boys or girls?
Edwards syndrome (trisomy 18) occurs more frequently in girls than boys. It is a genetic disorder caused by the presence of an extra copy of chromosome 18, leading to developmental abnormalities and various physical and mental impairments.
In what chromosome is the ear lobe trait located?
The ear lobe trait is not located on a specific chromosome, as it is a common genetic trait that is not influenced by a single gene or located on a specific chromosome. The presence or absence of ear lobes is determined by multiple genetic factors.
What are chromosome disorders caused by?
Aneuploidy, or the presence of an abnormal number of chromosomes, is the cause of several well-known genetic disorders. The most common manifestation of aneuploidy in humans is a trisomy, or having a third copy of some chromosome instead of the normal two. Here are some disorders caused by aneuploidy:Easily the best-known is Down Syndrome, which is caused by the presence of an extra chromosome 21. Down Syndrome causes various birth defects including heart failure and mental retardation, as well as a distinctive "offset" facial structure.Turner Syndrome is caused by the absence of one X chromosome in a woman (monosomy X). Most infants with Turner Syndrome are miscarried, but some survive; common symptoms include swollen appendages, underdeveloped breasts and infertility.Trisomy 18 (having an extra chromosome 18) causes high risk of miscarriage, mental deficiency and malformation of various body parts including the head, feet, fingernails and jaw.Klinefelter Syndrome is a non-life-threatening condition caused by the presence of an extra X chromosome in men; it results in a paucity of "masculine" features like armpit hair.Trisomies of many chromosomes (like 12, 13 and 18) lead to various genetic disorders that lower chances of survival at birth and cause malformation of various organs.The risks of aneuploidy rise with the mother's age. Over 40% of embryos in pregnant women aged 35 and older are abnormal. Most of these are not born, however. Nevertheless, one of every 19 children born to a 45-year-old mother has aneuploidy, as opposed to one of every 385 born to a 30-year-old.
