DH+homework+1

Human Life Cycle 16.1 p. 320 INSERTING FIGURES IS ALWAYS A GOOD THING. (1) How many chromosomes does a mother contribute to a new individual? A father? - mother : 23 - father : 23

(2) Where does meiosis occur in males? in females? - males : testes - females : ovaires

(3) Compare an egg cell to a sperm cell. - an egg cell is much larger than a sperm cell. They both carry 24 chromosomes. The sperms only job is to carry chromosomes, while the egg is "specialized to await the arrival of a sperm and to provide the new individual with cytoplasm in addition to chromosomes."

(4) What is the difference between meiosis and mitosis. - meiosis :

Development Chapter 17 17.1 (5) Describe in detail how fertilization occurs (6) What is polyspermy and how is prevented during fertilization? 17.2 (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? (11) What are the primary germ layers and what body structures come from each layer?