Can a blue crab find its identical twin?
A. No, spiral cleavage is determinate.
B. Yes, crab larvae reproduce via mitosis.
C. No, arthropods are deuterostomes, and twinning only occurs in protostomes.
D. Yes, the separation of embryonic cells is rare but not lethal.
Answer: A
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What structure is a series of interacting organelles that function to make lipids, enzymes and proteins?
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Suppose you are a genetic counsellor, and a man and woman come to you with concerns that if they have a child together, it could have hemophilia. Also suppose that the man has an X-linked recessive form of hemophilia, but the woman does NOT, and that genetic tests reveal the woman is NOT a carrier for hemophilia. Which of the following is the best advice you could give them?
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