Life Cycle Of Most Animals An Overview

Front 1

life cycle initiated by fusion of genetic material from two gametes is called

Back 1

fertilization and stimulates egg

Front 2

stage between fertilization and hatching is called

Back 2

embryogenesis

Front 3

immediately following fertilization __________ occurs

Back 3

cleavage

Front 4

cleavage is

Back 4

a series of extremely rapid mitotic divisions wherein the enormous volume of zygote cytoplasm is divided into smaller cells

Front 5

the cells that result in cleavage are called

Back 5

blastomeres

Front 6

and by the end of cleavage the blastomeres will form a sphere known as the

Back 6

blastula

Front 7

When mitotic rate slows down blastomeres will undergo

Back 7

gastrulation

Front 8

What happens in gastrulation?

Back 8

blastomeres undergo dramatic movements wherein they change position. Embryo is now in Gastrula phase

Front 9

what is a result of gastrulation? or what do you have at the end?

Back 9

three germ layers:
-ectoderm
-endoderm
-mesoderm

Front 10

After germ layers est. (i.e after gastrulation) what is the next phase

Back 10

organogenesis

Front 11

What happens in organogenesis

Back 11

cells interact with one another and rearrange themselves to produce tissues and organs.
Certain cells undergo long migrations from origin to final location

Front 12

Do many organs contain cells from just one layer?

Back 12

no often derive from more than one germ layer. For example outside generally from ectoderm and the inside from the mesoderm

Front 13

many egg cytoplasm has specialized portion of egg that gives rise to cells that are precursors of gametes. Gametes and precursors are collectively known as

Back 13

germ cells

Front 14

all other cells of the body are called

Back 14

somatic cells

Front 15

separation of somatic and germ cells is typically the ______ differentiation to occur.

Back 15

first

Front 16

Go through the stages of life cycle

Back 16