development
what 2 things does a developing embryo need?
-nourishment
-protection
What does the egg need to have that most animals going through internal development already have?
A way for the embryo to be nourished
A yolk provides the embryo with food
Embryo gets nourishment from
organs / tissues of the mother
what is fertilization?
The joining of an egg cell with a sperm cell
What are the benefits of internal fertilization?
Ensures that an embryo (developing offspring) is protected and nourished until it leaves the body
Increases the chance that it will survive, grow up, and reproduce
after fertilization, the zygote begins to develop into a what?
embryo
Eggs laid by reptiles often have
a tough leathery covering
Snakes, different species of fish, and some insects (cockroaches, beetles, etc.) all have
embryos who develop in an egg inside the body
Genetic material is also known as?
DNA
What is the most well known male animal that gives birth?
Females deposit eggs into pouch of males
Internal fertilization occurs there
a development that takes place inside the body occurs in.
an egg.
Eggs laid underwater often have
a jelly-like covering
where do these embryo's get nourishment from?
They get it from a yolk
Half of the DNA comes from what?
the egg, and the other half comes from sperm cell
Animals that reproduce using external fertilization:
Jellyfish
Clams
Sea Urchins
Sea stars
What does the egg need to have that most animals going through internal development already have?
- A way for the embryo to be nourished
- A yolk provides the embryo with food
Eggs laid by birds have a..
harder covering (shell)
Occurs for almost all
mammals except platypi and some anteaters
what is Zygote?
The new cell that is formed after an egg cell is fertilized
what is External Fertilization?
fertilization that occurs outside of the body
Mitosis means
Cellular division
how many embryo's per egg?
one embryo per egg
The young hatch while
inside the body then leave
The Zygote then develops into a what?
new organism over time
what is internal fertilization?
Fertilization that occurs inside the body of an animal