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Home Q & A Board Science-Related Homework Help Psychology Developmental Psychology
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9 years ago
The extra 21st chromosome that causes Down syndrome is
a.   usually provided by the egg.
b.   usually provided by the sperm.
c.   provided by the egg about half the time and by the sperm about half the time.
d.   usually created sometime during prenatal development.
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Children and Their Development

Children and Their Development


Edition: 3rd
Authors:
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iHomeiHome
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9 years ago
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9 years ago
My course has gotten a whole lot easier thanks to this.
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9 years ago
Happy to help.
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