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define sexual reproduction
the genetic material from two different cells produce an offspring
define fertilization
the joining of an egg cell with a sperm cell
define zygote
the new cell that is formed after an egg cell is fertilized
define gestation
the length of time between fertilization of an egg cell and birth of an animal
define metamorphosis
a development process where the form of the body changes as an animal goes from an egg to an adult
what happens with DNA in making an offspring
the DNA is split 50/50 from the egg cell and the sperm cell
what is the genetic material known as in cells
DNA
what does the zygote develop into
it develops into a ball of cells then into an embryo
gestation for a mouse is
21 days
first phase
egg
animals can also reproduce...
asexually (without a mate)
internal fertilization
takes place inside the body
define mitosis
cellular division
gestation for a human is
266 days
second phase
larva
what animals use external fertilization
-jellyfish
-clams
-sea urchins
-sea stars
etc.
external fertilization
takes place outside the body
process of mitosis
two daughter cells are created from parent cell each daughter gets DNA from parent cell
gestation for elephant
third phase
pupa
what is one of the only mammals that lay eggs
platypus
which is safer internal fertilization or external fertilization
counting for external fertilization predators can take the eggs and eat them but with internal fertilization the embryo is safe inside the mother but if the mother gets killed then it will die too but in other words internal is safer
an embryo need two things to survive
-nourishment
-protection
gestation for kangaroo
35 days
adult