Paul Andersen starts with a brief description of asexual and sexual reproduction. He explains how meiosis ensures variation in the next generation. He describes the important structures in the male and female reproductive system. He explains how the menstrual cycle ensure the success of the released ovum. He also shows how a zygote becomes a blastula, gastrula, embryo and fetus.
Rating 426 Views Updated: Friday, July 29, 2016 - 4:16am