Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

DAT > Biology - Embryology > Flashcards

Biology - Embryology Flashcards

0
Q

Where does fertilization take place?

A

Lateral portion of the Fallopian tube.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
1
Q

How many hours after ovulation can an egg be fertilized?

A

12-24 hours

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is cleavage?

A

Mitotic division

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Does protoplasm change in cleavage?

A

No. The total volume of cytoplasm remains constant.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is formed from repeated cleavages?

A

Smaller cells with increasing nuclear to cytoplasm ratio.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

How does the surface to volume ratio change with cleavage?

A

It increases so has exchange is improved.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is formed from indeterminate cleavage?

A

Cells that retain ability to become an organism…..identical twins.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What results from determinate cleavage?

A

Cells whose future differentiation is determined at early stage.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

When does first cleavage of zygote occur?

A

32 hours after fertilization.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

When does 8-felled embryo reach the uterus?

A

After 3rd cleavage - 72 hours after fertilization.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What is a morula?

A

Solid ball of embryonic cells.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is a blastula?

A

Hollow sphere of cells made from blastulation of the morula.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

When is blastula formed?

A

4 days after fertilization.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

When does embryo adhere to uterine wall?

A

As a blastula.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is a gastrula?

A

3 layered structure. (Three germ layers)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What are the 3 layers of a gastrula?

A

Ectoderm
Endoderm
Mesoderm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is the ectoderm?

A

Integumentary, lens of eye, retina, and nervous system.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What is the endoderm?

A

Epithelial linings of digestive and resp tracts, parts of the liver, pancreas thyroid and bladder.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What is the mesoderm?

A

Musculoskeletal system, circulatory system, excretory system, connective issues, portions of digestive and resp organs.

19
Q

Where does embryo of a fish or amphibian develop?

A

In the egg that is laid in the water?

20
Q

What is a chorion in an egg?

A

Inside of the shell….membrane permitting gas exchange.

21
Q

What is the allantois in an egg?

A

Saclike structure used for respiration and excretion. Contains blood vessels to transport oxygen, CO2, water and salt and waste.

22
Q

What is the amnion in an egg?

A

Membrane enclosing amniotic fluid of an egg.

23
Q

What is amniotic fluid in an egg?

A

Aqueous environments that protects embryo from shock.

24
Q

What is the yolk sac in an egg?

A

Encloses the yolk. Transfer food to embryo.

25
Q

Marsupials develop in a placenta?

A

No. Neither do some tropical fish.

26
Q

How does has exchange occur in a fetus?

A

Across the placenta.

27
Q

Name the 4 extra-embryonic membranes formed during development:

A

Amnion
Chorion
Allantois
Yolk sac

28
Q

What is the amnion in placental development?

A

Thin membrane containing amniotic fluid.

29
Q

What is the chorion in placental development?

A

Membrane completely surrounding amnion.

30
Q

What is the allantois in placental development?

A

Third membrane. Develops as an out pocketing of the gut.

31
Q

What does the umbilical cord develop from?

A

Enlarged blood vessels of the allantoic wall.

32
Q

What is the yolk sac in placental development?

A

Site of early development of blood vessels.

33
Q

3 stages of labor:

A

Cervix thins and dilates as amniotic sac ruptures.
Rapid contractions
Uterus contracts to expels the placenta and umbilical cord.

34
Q

What is different about arthropod and mammal maturation?

A

Arthropods are suspended in pupal stage. Mammals develop uninterrupted.

35
Q

What is the epicotyl?

A

Precursor of upper stem and leaves.

36
Q

What are the cotyledons?

A

Seed leaves. Dicots have two seed leaves and monocots only have one seed leaf.

37
Q

What is the hypocotyl?

A

Develops into the lower stem and root

38
Q

What is the endosperm?

A

Grows and feeds the embryo of a plants.

39
Q

What absorbs the endosperm in dicots?

A

Cotyledon

40
Q

What is the seed coat?

A

Develops from the outer covering of ovule.

41
Q

What is fruit formed from?

A

Ovary walls, the flower base and flower pistil

42
Q

What are meristem cells?

A

Undifferentiated cells in plants. Activate cell reproductions.

43
Q

What is the apical meristem?

A

Tips of rotor and stems. This is where growth in length occurs.

44
Q

What is the lateral meristem/cambium?

A

Between xylem and phloem. Permits growth in diameter.

45
Q

What kind of plants have an active lateral meristem/cambium?

A

Woody dicots like oaks. (not monocots like grass or herbaceous dicots like alfalfa)

DAT (15 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions