What genetic disorder that is caused by an extra copy of chromosome 21?

Correct answer: Down syndrome

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What people think about it: 8 Comments

Tina's twin

my little sis was born w downs n she functions as a 5 to6 yr old, unless it involves music. motown, coutry, gospel, boy bands...etc. her knowledge is fierce! plus, she has NO heart defects n after years of work excellent muscle strength control.at age 48 years, we still put a brass key out for santa every year. my sis, beyond doubt a blessing most appreciated. true love

Player #37776202

The most beautiful people in the world have downs

Gypsy

I work 12 hours a day with the mentally challenged. And it is very rewarding when an individual learns to be more independent and making decisions concerning their lives.

Renée

My daughter has 22q11.2 duplication. 22q11.2 deletion is the second most common chromosomal abnormality after Down Syndrome but most people haven't heard of it.