WS+Development+Questions

__**Human Life Cycle 16.1 p. 320 INSERTING FIGURES IS ALWAYS A GOOD THING.**__ The mother gives 23 and so does the Father In the testes in males and in the ovaries in females sperm in smaller than an egg and both carry 23 chromosomes. Meiosis is cell division and the chromosomes number is reduces Mitosis is cell division and the number of chromosomes remains constant
 * (1) How many chromosomes does a mother contribute to a new individual? A father?**
 * (2) Where does meiosis occur in males? in females?**
 * (3) Compare and egg cell to a sperm cell.**
 * (4) What is the difference between meiosis and mitosis.**

__**Development Chapter 17 17.1**__ 1. sperm makes its way through the corona radiata 2. acrosomal enzymes digest a portion of zona pellucida 3. sperm binds to and fuses with egg plasma membrane 4. sperm nucleus enters the cytoplasm 5. cortical granules releases enzymes; zona pullicida becomes fertilization membrane 6. sperm and egg pronuclei are enclosed in a nuclear envelope once a sperm touches the membrane then the membrane depolarizes __**17.2**__ First the zygote splits and begins to divide. Then the cells start to grow; next the embryo starts to move. Lastly it starts to take shape and structure it is the outside of the embryo and it is the shell the performs gas exhange the development of the embryonic placenta, then the yolk sac, which holds the waste. amnion enlarges and so does the embryo the fetus grows and starts to take on structure (11) What are the primary germ layers and what body structures come from each layer? they are the layers protecting the fetus from germs,
 * (5) Describe in detail how fertilization occurs**
 * (6) What is polyspermy and how is prevented during fertilization?**
 * (7) Describe the processes involved in development.**
 * (8) What are the extraembryonic membranes and what is their role?**
 * (9) What happens during pre-emrbyonic development?**
 * (10) What happens during embryonic development?**