Chick Embryo Lab - A developing seven-day-old chick embryo Chick Embryo Lab - A four-day-old chick embryo Chick Embryo Lab - A microscopic view of a four-day-old chick embryo Chick Embryo Lab - A microscopic view of a seven-day-old chick embryo Chick Embryo Lab - A nine-day-old and seven-day-old chick embryo Chick Embryo Lab - A seven-day-old chick embryo Chick Embryo Lab - Deanne explains the fundamentals of chick development Chick Embryo Lab - Developmental genetics is so cool! Chick Embryo Lab - The head of a nine-day-old chick embryo Chick Embryo Lab - The lower half of a nine-day-old chick embryo Chick Embryo Lab - The students crack open their chick eggs Chick Embryo Lab - What a lucky guy! Chick Embryo Lab - Yuck! Sand Dollar Fertilization Lab - A microscopic view of sand dollar eggs immediately following fertilization by the sperm Sand Dollar Fertilization Lab - A microscopic view of sand dollar sperm Sand Dollar Fertilization Lab - A view of fertilized sand dollar eggs Sand Dollar Fertilization Lab - A view of the egg as the fertilization envelope forms Sand Dollar Fertilization Lab - A view of the sperm that were not able to fertilize an egg Sand Dollar Fertilization Lab - An egg immediately following penetration by the sperm Sand Dollar Fertilization Lab - Aww, the sand dollars are cute Sand Dollar Fertilization Lab - Deanne explains how sand dollars are injected with KCl to induce gamete release Sand Dollar Fertilization Lab - Sand dollar zygotes at all stages of cell division Sand Dollar Fertilization Lab - Sand dollar zygotes at different stages of cleavage Sand Dollar Fertilization Lab - Sand dollar zygotes at the two and four cell cleavage stages Sand Dollar Fertilization Lab - The students view the sand dollar eggs on the big screen Sand Dollar Fertilization Lab - The students watch sand dollar fertilization under the microscope Sand Dollar Fertilization Lab - The zygotes in the blastula (hollow ball of cells) stage Sand Dollar Fertilization Lab - The zygotes in the blastula stage of development Sand Dollar Fertilization Lab - The zygotes undergoing several cell divisions Sand Dollar Fertilization Lab - To prevent polyspermy, the egg generates a fertilization envelope