11.4 HUMAN REPRODUCTION

IB BIOLOGY

LET’S TALK ABOUT (ALL THE STUFF THAT HAPPENS BEFORE AND AFTER) SEX

What do you remember from the video?

Melinda and Sergio

THE SPERM

THE SPERM

SPERMATOGENESIS

List the 5 different cell stages of sperm development.

SPERMATOGENESIS

Spermatogonia

Primary spermatocyte

Secondary spermatocyte

Spermatid

Sperm

THE OVUM

THE OVUM

OOGENESIS

What are the 5 cell stages in ovum development?

OOGENESIS

Oogonium

Primary oocyte

Secondary oocyte

Ootid

Ovum

STOP. HAMMER TIME.

…ALSO REVIEW TIME

SPERMATOGENESIS VS OOGENESIS

Spermatogenesis Oogenesis

Location Testis Ovary

Number of gametes produced Life long production Fixed amount

Gametes per germ cell Four One

Beginning of process Begins at puberty Begins during fetal development

Timing of gamete formation Continuous (any time)

Once a month (menstrual cycle)

End of process Fertility is life long but reduces

Fertility stops at menopause

Timing of gamete release Any time Monthly cycle

Meitoic divisions Uninterrupted Arrested

Germ line epithelium Involved in gamete production

Not involve in gamete production

FERTILIZATION

What are the 3 main stages of fertilization?

FERTILIZATION

Acrosome reaction

Penetration of the egg membrane

Cortical reaction