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Persons with Down syndrome usually have ...

Persons with Down syndrome usually have _____ copies of chromosome 21.

A

no

B

one

C

two

D

three

Text Solution

AI Generated Solution

The correct Answer is:
To answer the question about how many copies of chromosome 21 are found in a person with Down syndrome, we can follow these steps: 1. **Understand Down Syndrome**: Down syndrome is a genetic disorder caused by the presence of an extra copy of chromosome 21. This condition is also known as Trisomy 21. 2. **Identify the Normal Chromosome Count**: Normally, humans have two copies of each chromosome, one inherited from each parent. For chromosome 21, this means there are typically 2 copies. 3. **Determine the Chromosome Count in Down Syndrome**: In individuals with Down syndrome, there is an additional copy of chromosome 21, leading to a total of three copies. 4. **Conclude the Answer**: Therefore, a person with Down syndrome usually has 3 copies of chromosome 21. ### Final Answer: Persons with Down syndrome usually have **3 copies** of chromosome 21. ---
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