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An extra copy of chromosome 21 in humans causes Down syndrome cystic fibrosis HIV none of the above
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3 votes
An extra copy of chromosome 21 in humans causes

Down syndrome
cystic fibrosis
HIV
none of the above

User Gmagno
by
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2 Answers

6 votes
Down syndrome is the result of an extra copy of chromosome 21 in a human.
User JonathanDavidArndt
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5.4k points
5 votes

Answer:

Down syndrome is when there is an extra copy of chromosome 21

User Etienne Gautier
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