Today in Developmental Biology Class, we injected Potassium Chloride into sea urchins (Echinoderms) .5ml at a time just below the membrane surrounding their mouth (which can be seen in the photo below). After 4ml, my sea urchin excreted sperm, which means he's a boy! Using his sperm and an egg from another person, we were able to watch fertilization and the first cleavage under the microscope. One of the neatest things I've ever seen.
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