Main Idea Animals have specialized structures for sexual reproduction Gonadsspecialized reproductive organs that produce sperm or eggs Ovaries produce egg cells Testes produce sperm Female Male ID: 481253
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Slide1
Animal Reproduction
Main Idea: Animals have specialized structures for sexual reproduction.Slide2
Gonads-specialized reproductive organs that produce sperm or eggs
Ovaries produce egg cells
Testes produce sperm
Female
MaleSlide3
How does animal fertilization occur?
Egg cell + sperm cell= diploid zygoteSlide4
Fertilization
Happens inside of body-deposit sperm in or near a female’s reproductive system
Earth worms, spiders, insects, reptiles, birds, and mammals
Happens outside of an animal’s body, in the environment
Eggs and sperm released in water
Large number of eggs released to ensure survival
Jellyfishes, clams, sea urchins, sea stars, some fish and amphibians
Internal Fertilization
External FertilizationSlide5
How do animal embryos develop?
Zygote (mitosis and cell division) embryo
(fertilized egg) (diploid organism)Slide6
How do animal embryos develop?
Protected and develops inside an egg
Yolk provides food
Birds, lizards, snakes
Develop inside mother
Organ or tissue transfers nourishment from mother to embryoSome snakes, insects, and fishes develop in egg with yolk, while inside of mother
External Development
Internal DevelopmentSlide7
External development continued
Metamorphosis- developmental process in which the form of the body changes as an animal grows from the egg to an adultSlide8
Gestation
Length of time between fertilization and birth of an animal
Varies among species and relates to the size of the animal at birth
Examples:
Mouse 21 days
Dog 60 daysHumans 266 daysElephants 600 daysSlide9
Questions
Compare internal and external fertilization.
Why do animals that reproduce by external fertilization produce more eggs than animals that reproduce by internal fertilization?
In your own words, write the definition of metamorphosis.