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Animal Physiology, Reproduction and developement > Fertilisation > Flashcards

Flashcards in Fertilisation Deck (16)
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1

summarise fertilisation

fusion of egg and sperm to form zygote

2

what is the main function of fertilisation?

Combining haploid sets of chromosomes from two parent to form single diploid cell

3

What is the cell formed during fertilisation called?

Zygote

4

What is polyspermy?

Multiple spem fertilise the egg

5

Where does fertilisation generally occur in mammals?

Internally, in moist environment to allow sperm to move

6

What happens to the sperm once in the egg?

Centriole acting as basal body for flagella produces spindles fibres for first mitotic devision.

7

Where does sperm enter in the egg in amphibians?

In the animal hemisphere

8

What are the two hemispheres of the egg called?

Vegetal pole and animal pole

9

What is the animal pole?

Where the nucleus is, consists of several small cells that divide rapidly

10

What is the vegetal pole?

Contains large yolky cells that divide very slowly, Thought to develop into extra embryonic membranes

11

How is the animal/vegetal axis determined?

defined by the placement of the nucleus in the egg, occurs before fertilisation

12

How is dorsal/ventral axis determined?

By point of sperm entry, cells opposite will eventually become dorsal portion of body

13

What doe dorsal mean?

the upper side or back of an animal, plant, or organ

14

What does ventral mean?

the underside of an animal or plant

15

What does anterior mean?

front of the body/ head

16

What does posterior mean?

Bottom of body/end