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Why is it that a mongoloid person have 65 chromosomes?
People with Down syndrome, also called mongoloidism have 47 chromosomes. Having 65 chromosomes would be lethal, as normally having 47 chromosomes is lethal. Down syndrome is also known as trisomy 21, because instead of two copies of chromosome 21, a person with Down syndrome has three copies, which accounts for the 47th chromosome.
Which stage of meiosis causes Down syndrome?
Mistakes in meiosis may cause Down syndrome. The error happens when the chromosomes segregate into the gametes. The egg or sperm may have too many or too few chromosomes. Down syndrome has an extra chromosome in the 21st pair.
What happens if a egg cell has 24 chromosomes and is fertilized by a sperm cell containing 23 chromosomes.?
The resulting zygote would have 47 chromosomes, which is an extra chromosome compared to the normal human chromosomal number of 46. This condition is called trisomy and can lead to genetic disorders such as Down syndrome.
How many chromosomes does a person with Down Syndrome have?
Down Syndrome is when you have a trisomy of chromosome number 21. So that means they have 47 chromosomes. An older name for Down Syndrome is Mongolism. That was considered a racist term because it made fun of the features of people from Mongolia. Its use was dropped in 1965 after a delegate from Mongolia asked that the name be dropped as a medical term.
What is an example of a disorder associated with an error in the number of chromosomes present?
Down syndrome (trisomy 21) is a disorder associated with an error in the number of chromosomes present. Other examples of disorders associated with an error in the number of chromosomes are Trisomy 18 (Edwards Syndrome), Trisomy 13 (Patau Syndrome), Triple X syndrome, and Klinefelter Syndrome.
What chromosomes do you get an extra copy for in humans that results in Down syndrome?
Down Syndrome is caused by a triplication of the 21st chromosome.
Difference between the chromosomes of a person with Down syndrome and a person without Down syndrome?
An individual with Down Syndrome has the presence of all or part of an extra 21st chromosome.
People with down syndrome have how many chromosomes?
47There are 47 chromosomes in someone with Down syndrome; the 21st pair has an extra chromosome. Most people have 46 chromosomes. Down syndrome is also known as "Trisomy 21" - a reference to the fact that someone with Down syndrome has 3 pairs of chromosomes on their 21st pair.
How many chromosomes are in a down syndrome affected cell?
Forty-seven. In Down syndrome, there is an extra 21st chromosome. It is also known as Trisomy 21.
What type of disorders are karyotyping used to diagnose?
Chromosomal disorders can be observed in a human karyotype. It can show whether there are extra chromosomes, or missing chromosomes, or malformed chromosomes, or whether chromosomes have extra pieces, or missing pieces.
Does Down syndrome occur in a specific location?
Down Syndrome is known as trisomy 21 because someone with the syndrome has 3 chromosomes of the same type when we are only supposed to have 2 (one from each parent). Chromosomes are paired and numbered so Down Syndrome is the result of having 3 of the #21 chromosome. The body will not know what to do with the extra chromosome so as a precautionary measure it will shut down all 3 and the genes that are within the chromosomes can no longer be accessed. So as you can see, Down Syndrome is not from being inherited by a specific gene. It is due to an error in meiosis in either the mother or the father.
How are cells of a person with Down syndrome different from those of a person without the disorder?
In Down syndrome, a person's cells have an extra copy of chromosome 21. In other words, instead of a pair of chromosomes, a person with Down syndrome has three of that chromosome. Down syndrome most often occurs when chromosomes fail to separate properly during meiosis. People with Down syndrome have a degree of mental retardation. Heart defects are also common, but can be treated.
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...
Why is it that a mongoloid person have 65 chromosomes?
People with Down syndrome, also called mongoloidism have 47 chromosomes. Having 65 chromosomes would be lethal, as normally having 47 chromosomes is lethal. Down syndrome is also known as trisomy 21, because instead of two copies of chromosome 21, a person with Down syndrome has three copies, which accounts for the 47th chromosome.
What are three disorders caused by missing or extra chromosomes?
1) down's syndrome2) turner syndrome3) jacob's syndrome
Down syndrome is caused by having an extra copy of what chromosomes?
21, the condition is also referred to as trisomy 21.
Which stage of meiosis causes Down syndrome?
Mistakes in meiosis may cause Down syndrome. The error happens when the chromosomes segregate into the gametes. The egg or sperm may have too many or too few chromosomes. Down syndrome has an extra chromosome in the 21st pair.
