science
what kind of cell does a female have
egg cell
What kinda male cell does a male have
sperm cell
If animals dont reprodce sexually what do they do?
They produce asexually
Fertilizaation
The joining of an egg cell with a sperm cell
Gestation Period
The length of time between the fertilization of an egg cell and birth of an animal
True or false
do animals all go through the same metamormphisis?
false
A developing embryo needs two things
Nourishment and protection
What is internal fertilization?
Fertilization that occurs inside the body of an animal
What are the benefits of internal fertilization?
it is safer since it's inside of its mother
External Fertilization
fertilization that occurs outside of the body
Eggs typically have a covering that helps keep it refreshed and protected from predators
Eggs laid by reptiles often have a tough, leathery covering
How do animals who utilize external fertilization ensure that some offspring survive?
Lay more eggs
what is Sexual Reproduction?
The genetic material from two different cells produce an offspring
Why is this more successful than external fertilization?
Eggs that are externally fertilized have a lower chance of survival due to exposure to elements / predators
Animals that reproduce using external fertilization
Jellyfish
Clams
Sea Urchins
Sea stars
Several types of fish
Amphibians
Embryos that develop inside of the animal?
Occurs for almost all mammals except platypi and some anteaters
what is mitosis?
ceullar division
Two daughter cells are created from one parent cell
Each daughter cell gets DNA from parent cell
what is a zygote?
The new cell that is formed after an egg cell is fertilized
What is difference between zygote and embryo?
Zygote is one single celled organism (an egg cell fertilized by sperm cell)
Embryo is multicellular - it is the developing offspring
Metamorphosis is?
A developmental process where the form of the body changes as an animal goes from an egg to an adult
Phases of metamorphosis?
Phase 1: Egg
Phase 2: Larva: pre-adult phase where newly hatched animal grows and develops
Phase 3: Pupa: Inactive phase where larva transforms into adult
Phase 4: Adult
Of the animals that utilize external fertilization, what do they have in common?
All takes place in the water, sperm cells need an avenue to get to the egg cells
How does the offspring of animals receive the genetic material that allows them to develop?
Genetic material is also known as DNA. The DNA comes from the sperm cell and egg cell - 50% from the mom and 50% from the dad
whats a average kangaroo's gestation period?
35 days
how long is a elephants gestation period?
(hint 550<)
600 days