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What effect does Down syndrome have on the chromosomes?
Down syndrome is usually caused by a condition known as Trisomy 21, which means that a person has three copies of Chromosome 21, rather than the usual two copies. An extra chromosome is added. The normal amount is 46, but people with Down syndrome have 47.Occasionally, the condition is a result of part of Chromosome 21 becoming fused to the end of another chromosome.More info on Chromosome 21While Chromosome 21 isn't the shortest chromosome, it is the one that contains the fewest genes (other than the Y chromosome). This is because genes on Chromosome 22 are more closely spaced, and thus the chromosome contains more genes, despite its smaller size.
Is it possible to have a XXY chromosome set for gender?
Yes, individuals with an XXY chromosome combination have a condition known as Klinefelter syndrome. This can affect physical development and may lead to infertility, but gender identity is not solely determined by chromosomes.
What is trisomy mutation?
A trisomy is when a person has 3 versions of a chromosome. 'Normal' humans will only have 2 of each chromosome. For example, having 3 versions of chromosome 21 is known as Trisomy 21 or Down Syndrome.
Is turner syndrome inheritable or random?
Turner syndrome is usually random and not inherited. It occurs when a female is born with a missing or incomplete X chromosome. In rare cases, Turner syndrome can be inherited if one parent carries a chromosomal abnormality.
Are gentic defects associated with abnormalities of autosomes or of sex chromosomes explain?
Genetic defects can be associated with abnormalities in both autosomes (non-sex chromosomes) and sex chromosomes. Autosomal genetic defects are usually inherited in a dominant or recessive manner, affecting both males and females. Sex chromosome abnormalities, such as Turner syndrome or Klinefelter syndrome, involve abnormalities in the X or Y chromosomes and typically lead to specific developmental or reproductive issues.
Down syndrome is usually caused by an extra copy of what chromosome?
Down syndrome occurs because of the extra chromosome on chromosome 21. If you go onto google images and type in karyotype of Down syndrome, you will find a picture of the extra chromosome. Instead of having two chromosomes on chromosome 21, there is an extra. Type your answer here...
How do you know you have Down syndrome?
a test is usually done in pregnancy which identifies the condition. people with Down syndrome have an extra chromosome. people with down syndrome usually have impaired cognitive ability and typical facial characteristics such as an oversized tongue and are usually small in stature
How many copies of Chromosome 21 are there in someone who has Down syndrome?
3 Pairs of Chromosome 21There are 47 chromosomes in someone with Down syndrome (most people have 46); the 21st pair has an extra chromosome. Down syndrome is also known as "Trisomy 21" - a reference to the fact that someone with Down syndrome has 3 pairs of chromosomes 21.
What causes prader wili syndrome?
PWS is usually not inherited in MOSt cases. It occur as random events and is caused by the deletion of chromosome 15.
How many chromosomes would the body of a women born with Turner's syndrome have?
45. 22 pairs plus one chromosome; the one X Turner's syndrome women usually posses.
Can boys get turner syndrome?
Most girls are born with two X chromosomes, but girls with Turner syndrome are born with only one X chromosome or they are missing part of one X chromosome. The effects of the condition vary widely among girls with Turner syndrome. It all depends on how many of the body's cells are affected by the changes to the X chromosome.
What effect does Down syndrome have on the chromosomes?
Down syndrome is usually caused by a condition known as Trisomy 21, which means that a person has three copies of Chromosome 21, rather than the usual two copies. An extra chromosome is added. The normal amount is 46, but people with Down syndrome have 47.Occasionally, the condition is a result of part of Chromosome 21 becoming fused to the end of another chromosome.More info on Chromosome 21While Chromosome 21 isn't the shortest chromosome, it is the one that contains the fewest genes (other than the Y chromosome). This is because genes on Chromosome 22 are more closely spaced, and thus the chromosome contains more genes, despite its smaller size.
Is it possible to have a XXY chromosome set for gender?
Yes, individuals with an XXY chromosome combination have a condition known as Klinefelter syndrome. This can affect physical development and may lead to infertility, but gender identity is not solely determined by chromosomes.
When did Russell Silver syndrome develop?
No one knows when Russell Silver Syndrome developed but it is caused by a copy of the seventh chromosome. People usually get the copy from their mother. Russel Silver syndrome is a TREATABLE form of dwarfism. This is treated with the write diet
Is Edwards syndrome autosomal or sex-linked?
Down Syndrome is a trisomy of the 21st chromosome as opposed to an allelic inheritance through the X chromosome. Trisomy is a somatic disorder caused by improper division during gametogenesis (usually of the ovum) that results in 3 copies of the 21st chromosome in the egg once it is fertilized.
What causes disorders such as klinefelter syndrome and turner syndrome?
Klinefelter syndrome is a chromosomal condition that only affects males and is characterized by a male having an additional X chromosome (XXY) in cells. This chromosome abnormality occurs when there is an error in cell division, resulting in an extra copy of the X chromosome.
Why are males more likely to have fragile X syndrome?
males have only one copy of the X chromosome. Males who inherit the full mutation are expected to have mental impairment. A female's normal X chromosome may compensate for her chromosome with the fragile X gene mutation
