Respuesta :
When a person has down syndrome, he or she has an extra chromosome 21. therefore, down syndrome is a kind of "aneuploidy" and results from "non-dis-junction of chromosome 21 during meiosis I".
What is down syndrome?
When chromosome 21 is fully or partially duplicated, Down syndrome is present.
The cause of down syndrome is-
- Every cell within the human body has a nucleus, which houses the genes that store genetic material.
- All of our inherited qualities are encoded by genes, which are arranged along rod-like structures known as chromosomes.
- Each cell typically has 23 chromosome pairs in its nucleus, half of which inherited out of each parent.
Some characteristics of down syndrome are-
- This extra genetic material changes the development course and results in the Down syndrome-related traits.
- Low muscle tone, short stature, upward-slanted eyes, as well as a single deep crease in the middle of the palm are a few of the physical characteristics associated with Down syndrome, while each person with the condition is unique and may not have any of these characteristics at all.
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