UNIT 6: Reproduction“A Zillion Ways to Make More”

Ms.Liu

Biology

2/15/12

Sexual Reproduction

Sperm + ovum fertilized egg

GAMETES ZYGOTE

MEIOSIS vs. MITOSIS process

(Gametes) (somatic or all other cells)

Asexual ReproductionOne parent cell identical clones

1) Binary Fission

2) Fragmentation

3) Budding

Reproductive Strategies

• Number of offspring per birth:

–Offspring = “babies” (but not correct term)

Reproductive Strategies

• Reproductive structures:

–Sexual = ovary, ova/ovum, testes, sperm, DNA

–Asexual =genetic material

Reproductive Strategies

• Sexual maturity:

– The age at which the

organism is old enough to

mate, because his/her

reproductive organs are

fully developed

Reproductive Strategies

• Lifespan:

–How long the organism lives for

• Gestation period:

–The incubation time for growth and development of the embryo

Reproductive Strategies

• Mating behaviors:

– Rituals or activities the organism engages in to attract a mate (there are a variety)

Why is this important?

(Think biological continuity!)

Hormones • Male:

– Testosterone

• Female:– Estrogen– Progesterone

– Ova matures and released from ovaries on monthly cycle