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Home Q & A Board Science-Related Homework Help Psychology Developmental Psychology
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Ronyn Ronyn
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7 years ago
A person whose 23rd pair of chromosomes is XY
A) cannot be a fraternal twin.
B) has PKU.
C) has Down syndrome.
D) is male.
Textbook 
Exploring Lifespan Development

Exploring Lifespan Development


Edition: 3rd
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TulaTula
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7 years ago
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Ronyn Author
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#2
7 years ago
I *really* needed this, thank you
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