Sexual Reproduction

Ch 38.1 Guide

Ch 38.2 Development

I1.Sexual/Asexual Reproduction

Asexual

• Exact copy

• Mitosis

• One parent

• Constant conditions

Sexual

• Genetic variety

• Meiosis = eggs & sperm

• Two parents

• Changing conditions

Asexual examples: Hydra

Budding

of polyps

Regen-erationOf cut pieces

Amoeba asexual division

2nd amoebaNucleus

Asexual Reproduction:

Runners in strawberries

Spores in Puffball Mushrooms

Sexual Reproduction

“Joey” develops in a Pouch

Flowering Plants Sexual Reproduction

Dry PollenFor sperm

Ferns Sexual & Asexual Reproduction

Sexual & Asexual

Comparison of Egg & Sperm

Egg

• Round

• Floats

• Food reserves

• One

• Ovaries

• 1N

Sperm

• Oval

• Flagella

• No food reserves

• Many secrete enzyme to penetrate egg membrane

• Testicles

• 1N

Meiosis in the Gonads

Sperm

Meiotic celldivision Egg

Gonads make gametes!

Testes makesperm

Chromosomes

Sex Chromosome Y determines a Male

Gonads make gametes!

Ovaries make eggs

Tubal ligation

Reproduction HormonesHormone Produced by Function

Testosterone Testicles Male sex traits

FSH Pituitary Stimulates LH

LH Pituitary Release of egg

Estrogen Ovaries Female sex traits

Progesterone Corpus luteum Maintains Uterus lining

Menstrual Cycle