DevelopmentBH

SCI Human Biology - 1Assigned: 11/14 Due: 11/19Due on MONDAY.

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? Each parent contributes 23 chromosomes to the individual.

(2) Where does meiosis occur in males? in females? In males, meiosis takes place in the testes. In females, it takes place in the ovaries.

(3) Compare and egg cell to a sperm cell. the sperm is very small. it is made with a head and a tale so that it is able to swim within the semen. the sperm fertilizes the egg. the egg is a larger cell that holds the female chromozones. It is fertilized by the sperm.

(4) What is the difference between meiosis and mitosis. meiosis- meiosis requires to succesive divisions, called meiosis 1 and meiosis 2.

mitosis- is the type of cell growth that occurs during growth and tissue repairs. It is the process in which the the sperm fertilizes the egg causing it to grow.

Development Chapter 17 17.1 (5) Describe in detail how fertilization occurs First the penis enters the vagina and deposits sperm. the sperm swim up through the vagina and into the uterus.. millions of sperm are competing to penetrate the cell membrane.. the sperms head brakes off and delivers the chromosones from the male to the egg. this allows for the cell to duplicate itself.

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?