The probability of producing a normal child by two parents who are carriers for an autosomal recessive disorder is ____.
A. 0%
B. 25%
C. 50%
D. 75%
E. 100%
Answer: D
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a) primitive streak b) mesoderm c) embryonic disc d) ectoderm e) endoderm
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When does the reproductive system begin to function fully?
A. after menopause B. before puberty C. when puberty is complete D. at birth E. when there has been intercourse