When a child is conceived and has an XY chromosome type, that child is genetically a boy. Which of the following statements best reflects where his chromosomes came from?
a. He got his X chromosome from mom and his Y chromosome from dad.
b. He got the Y chromosome from mom, and the X chromosome from dad.
c. He got XX chromosomes from mom, but the XY chromosomes he got from dad were genetically dominant, and that is why he is going to be a boy.
d. It is impossible to know which chromosome came from which parent.
Answer: A
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