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Home , Egg cell, Gametogenesis

GAMETOGENESIS: The making of

GAMETE - ( OR ) GENESIS - TO MAKE OR CREATE Types of

: Makes MALE sperm cells

: Makes the egg cells

Both processes use as their type of , however the results are quite different.

Primary 46 SPERMATOGENESIS

Where does it occur? Secondary 23 23 In the TESTES

Description of Germ Cells 23 23 23 23 GERM CELLS in the testes are DIPLOID (2N, 46) just like the rest of the body cells.

Mature Sperm Cells Initial germ cells are called PRIMARY SPERMATOCYTES

What is produced?

1 round of spermatogenesis produces FOUR healthy sperm cells. Every sperm cell contains a unique combination of genes. (NO TWO ARE ALIKE!)

Primary OOGENESIS 46 Where does it occur? In the Secondary Description of the Germ 23 23 Cells GERM CELLS in the ovaries are DIPLOID (2N, 46) just like the rest of the body cells. 23 23 23 23 1 Ootid Initial germ cells are called PRIMARY OOCYTES

What is produced? X X X

1 round of Oogenesis 3 Polar Bodies produces ONE healthy (OVUM), and THREE POLAR BODIES. The polar bodies serve NO PURPOSE in the Mature Egg Cell (OVUM) body.

Once gametes are formed, can undergo SEXUAL and/or FERTILIZATION.

: The fusion of two gametes

 Fertilization: The fusion of the egg and sperm

Critical Concepts/Connections

 How is spermatogenesis different from oogenesis?  What are three sources of genetic diversity? (clue: 2 are from meiosis and 1 is from fertilization)  How are the terms sexual reproduction and fertilization different? (Why might scientists need two different terms)  In the creation of a child, when is meiosis necessary and when is necessary?