Fertilisation

Question 1

Answer 1

Outer Shell Membrane

Question 2

Answer 2

Thin Albumen

Question 3

Answer 3

Thick Albumen

Question 4

Answer 4

Nucleus

Question 5

Answer 5

Air Sac

Question 6

Answer 6

Chalaza

Question 7

Answer 7

Oocyte Membrane (Not normally visible)

Question 8

The Four Estrus Cycles

Answer 8

Monoestrus (Fox/Bear)

Polyestrus (Menstrual Cycle, humans)

Seasonally Polyestrus (Long/short day breeders)

Diestrus (Twice a year)

Question 9

Answer 9

Magnum/Ampulla

Question 10

Answer 10

Isthmus

Question 11

Answer 11

Infundibulum

Question 12

Give the 7 Stages of Fertilisation

Answer 12

1. Acrosome Reaction
2. Acrosome binds with zona pellucida
3. Membrane Binding
4. Cortical membranes fuse with Oocyte membrane
5. Cortical Reaction
6. Hardened Zona Pellucida
7. Polyspermy Block

Question 13

What is Cleavage?

Answer 13

Repeated mitotic division, forming blastomeres.

As they build, they form a morula and eventually a Blastula.

Question 14

Give the four planes of cleavage.

Answer 14

Meridional

Vertical

Equatorial

Lattitudinal

Question 15

What is happening in this diagram?

Answer 15

The Blastocyst is hatching from the zona pellucida and is embedding itself into the endometrium.

Question 16

1

Answer 16

Mesoblast

Question 17

6

Answer 17

Hypoblast

Question 18

5

Answer 18

Lacunae

Question 19

7

Answer 19

Heuser’s Membrane

Question 20

7

Answer 20

Heuser’s Membrane

Question 21

6

Answer 21

Hypoblast

Question 22

4

Answer 22

Cytotrophoblast

Question 23

3

Answer 23

Primary Umbilical Vesicle

Question 24

5

Answer 24

Lacuna

Question 25

Give the three patterns of implantation shown.

Answer 25

Centric Eccentric Interstitial

Question 26

Name the blue region.

Answer 26

Amnion

Question 27

Name the yellow region.

Answer 27

Umbilical Vesicle (Yolk Sac)

Question 28

1

Answer 28

Primitive Streak

Question 29

2

Answer 29

Primitive Pit

Question 30

3

Answer 30

Primitive Node

Question 31

4

Answer 31

Oropharangeal Membrane

Question 32

5

Answer 32

Cardiogenic Plate

Question 33

7

Answer 33

Mesoderm

Question 34

8

Answer 34

Endoderm

Question 35

9

Answer 35

Cloacal membrane

Question 36

1

Answer 36

Primitive Streak

Question 37

2

Answer 37

Epiblast

Question 38

3

Answer 38

Extraembryonic Mesoblast

Question 39

6

Answer 39

Hypoblast

Question 40

What is the Allantois?

Answer 40

Sac structure involved in nutrition and excretion of the embryo

Question 41

What is a somite?

Answer 41

A division of the body or an embryo.

Question 42

Which cells are formed by Ectoderm?

Answer 42

Skin Nerves Pigment

Question 43

Which cells are produced by mesoderm?

Answer 43

Muscle Red Blood Cells

Question 44

What do endoderm cells produce?

Answer 44

The internal organs

Question 45

A

Answer 45

Paraxial Mesoderm *(Seperates to form Somites)*

Question 46

B

Answer 46

Intermediate Mesoderm

Question 47

C

Answer 47

Lateral Plate Mesoderm

Question 48

The endoderm is split into which three regions?

Answer 48

Foregut, Midgut and Hindgut