Following fertilization, the egg cell undergoes several rounds of cell division, eventually forming a solid ball of cells that looks something like a blackberry, and this is the comparison that I make in class when discussing embryology for the DAT and MCAT. Yesterday, when I made this comment, one of the students look very confused, so I continued, "or a raspberry".
"Oh," she said. "That makes more sense. I was thinking the PDA."
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