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Zoology Lecture Unit 1 > Embryology > Flashcards

Embryology Flashcards

1
Q

Cells of the archenteron as defined as

A

Endoderm

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2
Q

What does the endoderm become?

A

Inner lining of the digestive tract and the respiratory tract

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3
Q

Blastomeres are not completely divided

A

Meroblastic (huge yolk)

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4
Q

A solid ball of cells

A

Morula

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5
Q

Mesoderm comes from areas around ___ in protostomes

A

blastopore

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6
Q

What does the inner cell mass become?

A

The embryo

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7
Q

Blastomeres are equal in size and completely divided

A

Holoblastic (low yolk)

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8
Q

Cells on the outside of the blastocyst?

A

Trophoblasts

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9
Q

Cells of a gastrula migrate in and form a pocket of cells called

A

Archenteron

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10
Q

zygote -> early cleavage -> late cleavage -> blastocyst -> embryonic plate -> primitive streak -> neural groove -> neural tube -> organ differentiation

A

Mammal path

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11
Q

“Everything else” Ex. Becomes muscle, cartilage, bone, blood…etc

A

Mesoderm

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12
Q

Embryonic cells / early embryonic cells

A

blastomere

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13
Q

__ becomes the outer covering of the animal

A

Ectoderm

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14
Q

-> late cleavage -> blastula -> gastrula -> yolk plug -> neural groove -> neural tube -> organ differentiation

A

Amphibian path

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15
Q

Mesoderm comes from out pockets of ___ in deuterostomes

A

archenteron

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16
Q

What does blastopore become for deuterostomes?

A

anus

17
Q

What are the 5 embryology pathways

A

Non-chordates Primitive chordate Amphibian Bird/Reptile Mammal

18
Q

Blastomeres are unequal in size and completely divided

A

Holoblastic (high yolk)

19
Q

__ becomes the dorsal nerve if the animal has one

A

Ectoderm

20
Q

-> gastrula -> neural groove -> neural tube -> organ differentiation

A

Primitive chordate path

21
Q

Cells of a gastrula migrate in and form a hole called

A

Blastopore

22
Q

Zygote -> early cleavage -> late cleavage -> blastula / blastocoel -> gastrula -> organ differentiation (larva)

A

Non-chordate path

23
Q

What do Trophoblasts become ?

A

The embryo’s portion of the placenta

24
Q

__ becomes the brain if the animal has one

A

Ectoderm

25
Q

Resting phase for amphibian path?

A

yolk plug stage

26
Q

Diploblastic

A

Endoderm and ectoderm

27
Q

64 cells -> 128 cells (Too many to count)

A

late cleavage

28
Q

blastodisk = ___ path

A

Bird / Reptile path

29
Q

Triploblastic

A

Endoderm, ectoderm and mesoderm

30
Q

What does blastopore become for protostomes?

A

mouth

31
Q

Difference between blastula and gastrula?

A

Formation of blastopore.

32
Q

zygote -> early cleavage -> late cleavage -> blastodisk -> primitive streak -> neural groove -> neural tube -> organ differentiation

A

Bird / Reptile path

33
Q

A hollow ball of cells

A

Blastocoel

34
Q

How many embryology pathways are there?

A

5

Zoology Lecture Unit 1 (4 decks)

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