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What is Internal Development?
Internal Development is when an embryo develops inside of the animal
What is the most well known male animal that gives birth?
Seahorse
What 2 things does the developing embryo need?
Nourishment and Protection
What type of shell does a reptile have?
They usually have a tough, leathery shell
What is External Development?
External Development is development that takes place outside the body and occurs in an egg
What are 3 animals that use External Fertilization?
Sea Stars, Clams, and Sea Urchin
What are the 4 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
What are 3 animals that use Internal Development?
Snake, Cockroaches, and Sharks
How many embryos are in an egg?
There is typically only embryo per egg
What is the difference between zygote and embryo?
Zygote is a one single celled organism and an embryo is multicellular
What is the definition of metamorphosis?
It is a developmental process where the form of the body changes as an animal goes from an egg to an adult
How do animals who utilize external fertilization ensure that some offspring survive?
They lay more eggs
What is the definition of mitosis?
It is a type of cellular division where 2 daughter cells are created from 1 parent cell.
What is the definition of Gestation Period?
The length of time between the fertilization of an egg cell and birth of an animal
How long is the gestation period of an elephant?
600 days
What is the definition of Sexual Reproduction?
The genetic material from two different cells producing an offspring
What does the egg need to have that most animals going through internal development already have?
A way for the embryo to be nourished and yolk that provides the embryo with food
After fertilization, the zygote begins to develop into an embryo. What does this occur through?
Mitosis
What is genetic material also known as?
DNA
The majority of animals reproduce sexually and if they do not reproduce sexually, they reproduce asexually which does not require what?
A sperm and an egg cell joining