Gamete formation; oogenesis and spermatogenesis; cleavage, blastulation, and gastrulation; organogeny and development of the nervous, digestive, excretory, circulatory, respiratory, skeletal, and reproductive systems; and formation of the extraembryonic membranes. Three lecture and two laboratory hours per week. Prerequisites: BIOL 113, 114, 133, 134. Recommended: BIOL 246. Credit, 3 hours. Offered spring semesters, even years.