Early Embryogenesis 1 (Ch.13) Flashcards Preview

Reproduction Exam 4 > Early Embryogenesis 1 (Ch.13) > Flashcards

Flashcards in Early Embryogenesis 1 (Ch.13) Deck (24):
1

What does syngamy refer to?
When does this occur?

The fusion of male and female DNA
When the embryo goes from a ootid to a zygote and the DNA is completely replicated

2

What does not grow during the early mitosis stage of embryo's?
Why?

The cytoplasm
It is energy expensive

3

The crucial transition in the early stages of embryonic development is when the embryo goes from ___ to ___

Morula
Early blastocyst

4

What is a totipotent cell?

A embryonic cell that has yet to differentiate at all and can become any cell it wants to

5

(T/F) All cells in the early embryo start as totipotent

True!

6

What is a pluripotent cell?

A embryonic cell that has differentiated into its general area (placental, cardiovascular)

7

(T/F) Pluripotent cells can differentiate into any cell they want to

False!
Only totipotent cells can do this

8

What is a degenerate embryo?

An embryo in which all the cells have died

9

An embryo will remain in the oviduct until around day (#)

4

10

(T/F) An embryo recovered in the oviduct can be transferred into a recipients uterus

False!
Must be transferred to the recipients oviduct

11

At which embryonic stage does it become hard to count the total number of cells?

Morula

12

What embryonic stage is characterized by a fluid filled cavity?

Blastula

13

A perfect embryo is given a Grade (#)

1

14

Describe a Grade 2 embryo

An embryo that contains some dead cells that do no divide

15

(#)% of fertile human embryos will die before they know pregnancy has occurred

50%

16

The development of a ___ is when the female will know she is pregnant

Placenta

17

(T/F) The formation of gap junctions and tight junctions signifies the end of totipotency

True!

18

A sudopregnancy will last for (#) days before the female knows that no viable offspring is present

40 days

19

(T/F) Only placental cell types are required for a viable embryo to develop

False!
Need placental AND fetal cells

20

The morula stage of embryonic development can be found in the (oviduct/uterus)

Uterus

21

All early embryonic cell divisions occurs within the ___

Zona pellucida

22

Describe implantation
What is the difference between livestock and humans?

When an embryo makes contact with the uterus
Livestock will stop at stage 4 (adhesion)
Human embryos will penetrate the endometrium

23

(T/F) Livestock embryos will penetrate the endometrium of the uterus

False!
This does not happen in livestock, it happens in humans

24

The formation of what two structures signifies the end of tonipotency?

Gap junctions and tight junctions