Describe asexual reproduction.
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organ in mammals through which materials are exchanged between a mother and an embryo
placenta
What are the two types of reproduction?
Sexual reproduction and asexual reproduction
metamorphosis with four stages: egg, larva, pupa, adul
complete metamorphosis
type of metamorphosis that has no larval stage
incomplete metamorphosis
__________ provide parental care to their young until they are independent.
mammals, birds
What is fertilization?
the joining of a sperm and an egg
What are some organisms that have external fertilization?
Fishes, amphibians, and aquatic invertebrates
a body form that looks like an upright vase
polyp
In the life cycle of a jellyfish, which body form reproduces asexually?
polyp
stage at which an insect undergoes major body changes
pupa
How do the offspring of asexual reproduction compare to the parent? Why?
They are identical because they have the same DNA
larval stage of a frog
tadpole
young insect that looks like a small adult without wings
nymph
fertilization that takes place inside the female organism’s body
internal fertilization
In the life cycle of a jellyfish, which body form reproduces sexually?
medusa
What is the joining of these two sex cells called?
Fertilization
the length of time between fertilization and birth
gestation period
Describe sexual reproduction.
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Why is sexual reproduction important for adaptation?
It produces new combinations of characteristics, which increases variation in the population
a body form that looks like an open umbrella
medusa
he egg of a land vertebrate
amniotic egg
Is this an example of sexual reproduction or asexual reproduction?
Asexual
How do sperm get from one sponge to another?
They are released into the water and swim to another sponge
fertilization that takes place outside the female organism’s body
external fertilization
In sexual reproduction, how does the DNA of the offspring compare to that of the parents?
It is a combination of DNA from both parents, so the offspring is not identical to the parents.
an immature form of an animal that looks different from the adult
larva
Sponges reproduce asexually when a new sponge grows from a parent and breaks off in a process called
budding
What are the two sex cells called?
Sperm and egg
Why does external fertilization usually take place in water?
To keep the eggs and sperm from drying out.