1. Warm Up #6
What is fertilization?

2. Animal Behavior and reproduction
Lesson 3: Animal Reproduction and Development

3. Essential Questions
What are the roles of male and female reproductive organs?
How do the two types of fertilization differ?
What are the different types of animal development?

4. How is development similar in different animals? Activity
Examine the pictures of young animals and adults.
What are some similarities between each baby and adult counterpart?

5. Sexual reproduction
Sexual reproduction – the genetic material from 2 different cells (sperm and egg) combine, producing an offspring
Most animals reproduce this way
Testes – the male reproductive organs that produce sperm
Sperm – reproductive cells with tails to help them swim through fluid to reach the egg
Ovaries – the female reproductive organs that produce egg cells
Egg – larger than sperm and can’t move on its own

6. fertilization
Fertilization – the joining of an egg cell with a sperm cell
Occurs inside the body or outside the body depending on species
Zygote – forms when a sperm cell fertilizes an egg cell
Develops into a new organism

7. fertilization Internal fertilization – occurs inside the body
Ensures that the embryo is protected and nourished until it leaves the body, which increases chances of survival
External fertilization – occurs outside the body
Eggs released outside body and then sperm fertilizes it
Egg and baby not cared for, which reduces chance of surviving
A large number of eggs are produced in hopes at least a few will survive

8. development The way that organisms grow as an embryo
External development – organisms that develop outside a mother’s body, usually in an egg
The egg contains food and a protective covering
Internal development – organisms that develop inside a mother’s body
Get food and protection from the mother

9. development
Gestation – the time between fertilization and birth of an animal
Varies from species to species and usually relates to the size of the animal
Ex: Mouse – 21 days
Human – 266 day
Elephant – 600 days

10. metamorphosis
Metamorphosis – a developmental process in which the form of the body changes as an animal grows from an egg to an adult
BrainPOP – Metamorphosis
Metamorphosis - book