Bryan is born with Down syndrome.If we could look at his chromosomes,we would find that:

Question

Quizplus · Accepted Answer

Down syndrome is caused by the presence of an extra copy of chromosome 21, also known as trisomy 21. This extra chromosome results in developmental delays, intellectual disability, and other physical characteristics commonly seen in individuals with Down syndrome. A person with Down syndrome will have a normal set of chromosomes, but an extra copy of chromosome 21.

Bryan Is Born with Down Syndrome