answersLogoWhite

0


Best Answer

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 21

While 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.

User Avatar

Wiki User

8y ago
This answer is:
User Avatar
More answers
User Avatar

AnswerBot

5mo ago

Down syndrome is caused by an extra copy of chromosome 21, resulting in a total of 47 chromosomes in each cell instead of the usual 46. This extra genetic material leads to physical and cognitive differences in individuals with Down syndrome.

This answer is:
User Avatar

User Avatar

Wiki User

10y ago

A baby will have an extra 21st chromosome on each strain of their DNA. This means on each DNA set there are three of 21 instead of two, which is why Down Syndrome is also referred to as Trisonomy 21.

This answer is:
User Avatar

User Avatar

Wiki User

15y ago

You have the terms reversed. Chromosomes, or the genes within them, cause Downs Syndrome

This answer is:
User Avatar

User Avatar

Wiki User

12y ago

No, Down Syndrome is caused by having an extra copy (three in total) of chromosome 21. This is why Down Syndrome is also known as Trisomy 21.

This answer is:
User Avatar

Add your answer:

Earn +20 pts
Q: What effect does Down syndrome have on the chromosomes?
Write your answer...
Submit
Still have questions?
magnify glass
imp
Related questions

What is the genetic disorder for having three 21 chromosomes?

down syndrome


What is the total amount of chromosomes do down syndrome children have?

21 chromosomes


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.


What is the diagnosis if you have 92 chromosomes?

down's syndrome


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.


What happens if a person have more chromosomes?

If it had more chromosomes it will cause to down's syndrome


Down Syndrome most often occurs when-?

Down Syndrome often occurs when chromosomes fail to separate properly during meiosis.


How do you spell downsindrowm?

The phrase is spelled Down Syndrome. Down Syndrome is a disorder caused by a mutation of the chromosomes.


What is the number of chromosomes affected in down syndrome?

#21


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.


Would a kartotype would be most likely be used to diagnose Down syndrome?

A person with Down Syndrome will have 3 chromosomes for the 21st autosome. Karyotypes show these chromosomes which help to diagnose Down Syndrome.


What chromosomes are affected in someone who has Down syndrome?

chromosome 21