Embryonic Development Flashcards Preview

CELL1001 > Embryonic Development > Flashcards

Flashcards in Embryonic Development Deck (52)
Loading flashcards...
1

Parthenogenesis

Development is initiated by the egg without fertilisation

2

Mus musculus

mouse

3

Gallus gallus

chick

4

Danio rerio

Zebrafish

5

Caenorhabditis elegans

nematode

6

Tribolium castaneum

red flour beetle

7

Bombyx mori

silk moth

8

Hox genes

Anterior-posterior patterning

9

Pax6

Eye develpment

10

Chordin/BMP

Neural development

11

Xenopus laevis

Clawed frog

12

Isolecithal eggs

Small and have little yolk evenly disributed in cytoplasm

13

Mesolecithal eggs

Large eggs with moderate to large amounts of yolk that is localised ot one half of egg

14

Telolecithal eggs

Moderate to large amounts of yolk that fill cytoplasm except for small area near animal pole

15

Centrolethical eggs

Yolk concentrated in centre with a peripheral layer of yolk free periplasm

16

In amphibians animal hemisphere is

darkly pigmented

17

In amphibians vegetal hempishere is

lightly pigmented

18

Mid-piece in spermatozoa contains

The base of the flagellum

19

Hydatidiform moles

Either diploid with only male chromosomes or triploid with two copies of male chromosomes and 1 copy of female chromosomes

20

Egg is surrounded by a membrane known as

Zona pellucida

21

Cortical reaction to fertilisastion

Prevents polyspermy by modifying ZP3 receptor

22

Holoblastic cleavage

Isolecithal and some mesolethical eggs and involves complete cleavage of egg

23

Trophoblast

Blastomere epithelium

24

Blastocoel

Cavity in the centre of embryo

25

Inner cell mass

Small population of non-trophoblast cells found at one end of the blastocoel

26

Morula

After 5th horizontal cleavage 4 tiers of 8 cells

27

Blastula

When cleavage becomes more variable

28

Meroblastic cleavage

Telolecithal and centrolecithal eggs with large amounts of yolk where complete cleavage is difficult

29

Discoidal cleavage

Only a small yolk free portion of egg is cleaved typically at animal pole

30

Superficial cleavage

Male and female haploid nuclei fuse deep within yolky centre of egg where first 9 nuclear divisions occur