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Down syndrome is caused by the presence of an extra chromosome 21, leading to a total of three copies instead of the usual two. This condition, known as trisomy 21, occurs during the formation of reproductive cells (sperm or egg) when there is an error in cell division. As a result, the fertilized egg has an abnormal number of chromosomes, which affects development and can lead to various physical and intellectual challenges. The exact reasons for this chromosomal error are not fully understood, but maternal age is a significant risk factor.
What else can I help you with?
What is the genetic disorder for having three 21 chromosomes?
down syndrome
What is a chromosomal disorder that could result from nondisjunction?
Disorders, such as Down's Syndrome, are caused by nondisjunction.
What is the correct spelling 'Down syndrome' or 'Down's syndrome'?
Down syndrome is generally the preferred spelling, although Down's syndrome is sometimes used in American sources.
Is down's syndrome inherited?
Most cases of down syndrome are not inherited. Translocation Down syndrome can be inherited.
What are diagnosis for down syndrome?
Down syndrome IS the diagnosis.
Where is down syndrome on your body?
Down Syndrome Is In Your Brain.
How preventable is down syndrome in the community?
how is down syndrome preventable?
Can be cured form down syndrome?
No, Down Syndrome is permanent.
What is the correct spelling - 'Down syndrome' or 'Down's syndrome'?
Down syndromeBoth spellings are correct and acceptable. And "syndrome" is sometimes uppercase and sometimes lowercase. On Answers.com, we choose the spelling "Down syndrome."
Can a girl with down syndrome have a boyfriend?
Yes, a girl with Down syndrome can have a boyfriend, and many do. People with Down syndrome have the same relationship needs as people without Down syndrome.
Is Angelman syndrome the same as Down syndrome?
Angelman syndrome is a genetic disorder, as is Down syndrome. But they are not the same. Angelman Syndrome involves a deletion of Chromosome 15, whereas people with Down syndrome have an extra copy of Chromosome 21.
What gene or chromosome is affected by down syndrome?
Chromosome 21 is tripled in Down syndrome.
