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Embryogenesis, immediately followed by, amplexus :frog::white_flower:, in…
Embryogenesis
Fertilization
Cleavage
Gastrulation
Organogenesis
Metamorphosis
larva or embryo → adult form (sexually mature)
almost every organ
is subject to modification :frog:
Gametogenesis
group of cells set aside to produce the next generation
germ cells
gametes
and
their precursor cells
germ cells eventually migrate to the gonads, where they differentiate into gametes.
to become mature, the germ cells must be competent to complete
meiosis
.
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chemical signals exchanged between the cells of the germ layers :zap:
formation of specific organs at specific sites
certain cells will undergo long migrations to their final location
notochord
formation (mesodermal cells) :frog::back::oil_drum:
signals to ectodermal cells above it
become cells of NS (change shape and rise up)
embryo at this stage:
neurula
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rate of mitotic division slows down
extensive cell rearrangements
embryo is said to be
in the
gastrula
stage
result:
embryo contains three
germ
layers (endoderm, ectoderm, and mesoderm) that will interact to generate the organs of the body.
endoderm
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mesoderm
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ectoderm
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blastopore :frog::back:
expands :ring:
cell migration inside (endo, meso)
extremely rapid mitotic divisions
zygote cytoplasm divided into smaller cells called
blastomeres
÷
at the end, blastomeres have formed a sphere, known as a
blastula
.
fusion
of the gametes ⚤
fusion of the pronuclei
embryo (zygote) has a genome
movement of cytoplasm
What are the 6
stages
of
embryogenesis
(the process between fertilization and hatching/birth)?
immediately followed by
amplexus :frog::white_flower:
in frog, begins with