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Dorthy Dorthy
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4 years ago
Rene has Down syndrome, which means that she has an extra chromosome on which chromosome pair?

▸ the 7th pair

▸ the 18th pair

▸ the 21st pair

▸ the 23rd pair
Textbook 
Understanding Human Development

Understanding Human Development


Edition: 3rd
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leavyjoaleavyjoa
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4 years ago
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Dorthy Author
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4 years ago
You make an excellent tutor!
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Good timing, thanks!
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2 hours ago
this is exactly what I needed
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