Embryonic Dev.

Question 1

Starts in the union of germ cell and when does it end?

Answer 1

Fertilization ( cleavage)

Question 2

Pattern of early mitotic division

Answer 2

Cleavage

Question 3

T/f The size of cell changes in cleavage.

Answer 3

f.it does not only the number of cell increase

Question 4

Formation of the priMary germ layers

Answer 4

Gastrulation

Question 5

What are the types of eggs based on characteristics?

Answer 5

Isolecithal, mesolecIthal, telolecithal, centrolecithal

Question 6

Sparse evenly distributed yolk

Answer 6

Isolecithal ( mammals)

Question 7

Moderate yolk & unevenly distributed

Answer 7

. Mesolecithal (amphibians)

Question 8

Dense yolk concentrated at one end

Answer 8

Telolecithal (birds & reptiles)

Question 9

Yolk concentrated at the middle

Answer 9

Centrolecithal (fly)

Question 10

Fertilization process in chronological order

Answer 10

Insemination- sperm capacitation-migration- acrosome reaction- forming of fertilization cone - penetration of sperm. - forming of fertilization membrane- formation of M&f pronuclei - union of m&f chromosomes

Question 11

Several mitotic divisions and what are the cells called?

Answer 11

Cleavage ( blastomere)

Question 12

A compact ball that have undergone mitotic division.

Answer 12

Morula

Question 13

What junction is a result of cleavage

Answer 13

Tight junction

Question 14

What junction forms the blastocoele

Answer 14

Gap junction

Question 15

What rises off of the superficial layer of the morula?

Answer 15

Trophoblast/ trophoectoderm

Question 16

What attaches the developing embryo to the uterine wall

Answer 16

Trophoblast

Question 17

It is a fluid-filled intercellular space which coalesce into a single cavity

Answer 17

Blastocyst cavity/ blastocoele

Question 18

When trophoblast, embryoblast, and blastocoele are present, what is it called?

Answer 18

Blastocyst

Question 19

What are the three germ layers formed in gastrulation?

Answer 19

Ectoderm, mesoderm, endoderm

Question 20

Inner cell mass develops into l. 2.in gastrulation?

Answer 20

Epiblast & hypoblast

Question 21

The inner cell mass forms these layers inside the thropoblast.

Answer 21

Epiblast& hypoblast

Question 22

The inner cell mass forms these layers inside the thropoblast.

Answer 22

Epiblast& hypoblast

Question 23

The invagination of epiblast cells forms?

Answer 23

Primitive groove- primitive streak

Question 24

It defines the longitudinal axis of the embryo and indicates the start of germ layer formation

Answer 24

Primitive streak

Question 25

The proliferation of epiblast cells along the streak forms what?

Answer 25

Endoderm & mesoderm

Question 26

The initial migrating cells join the hypoblast layer forming-?

Answer 26

Embryonic endoderm

Question 27

The mesoderm divides into?

Answer 27

Paraxial, intermediate, lateral mesoderm

Question 28

The mesoderm splits two layers bordering the coelom in lateral mesoderm

Answer 28

Somatic & splanchnic mesoderm

Question 29

Attached to ectoderm

Answer 29

Somatic mesoderm

Question 30

Joined to endoderm

Answer 30

Splanchnic mesoderm

Question 31

The mesoderm that stream through the primitive streak

Answer 31

Primary mesenchyme

Question 32

Organized cells having a distinct apical and basal surface

Answer 32

Epitheloid

Question 33

The mesoderm that streams through the primitive streak

Answer 33

Primary mesenchyme

Question 34

Temporary epithelioid turns to

Answer 34

Secondary mesenchyme

Question 35

Notochord-induced transformation of ectoderm into nervous tissue

Answer 35

Neurulation