Fertilization

Question 1

Where does fertilization occur?

Answer 1

first 1/3 of uterine tube close to ovary

Question 2

Penetration of zona pellucida

Answer 2

hundreds of sperm bind to zp, release acrosome to ‘digest’ it

Question 3

acrosomal reaction

Answer 3

release of chemicals from acrosomal membrane

Question 4

fusion of plasma membranes

Answer 4

dna enters oocyte. 2 sets from oocyte, 1 from sperm. sperm mitochondria destroyed, so only mother mitochondria is inherited.

Question 5

polyspermy

Answer 5

more than one sperm fusing with oocyte

Question 6

slow block to polyspermy

Answer 6

after 1 minute of fusion, no more sperm can enter oocyte. causes zona reaction.

Question 7

zona reaction

Answer 7

breakdown of sperm binding molecules on zona pellucida. Blocks sperm.

Question 8

pronuclei

Answer 8

(2) separate nuclei created after fusion

Question 9

polar body II

Answer 9

removes 1 dna from oocyte, so sperm and ovum have 2 amounts of dna.

Question 10

zygotic transcription

Answer 10

usage of both paternal and maternal dna. Mother runs cell for 8 hours, then father suppresses it and runs cell for awhile

Question 11

syngamy

Answer 11

breakdown of pronuclei and combination of maternal and paternal dna. then prepares for cell divistion