Animal Physiology - Lecture 4

Question 1

in birds ..% of eggs fail to hatch

Answer 1

10-15%

Question 2

Kakapo egg failure rate is ..

Answer 2

70%

Question 3

fertilisation may fail due to sperm/egg dysfunction

or the females strong .. system

Answer 3

immune

Question 4

embryo death may occur due to bad … or genetic ..

Answer 4

genes, incompatibility

Question 5

external factors such as .. or environmental .. may result in embryo death too

Answer 5

predation

stress

Question 6

…% of sperm pass vagina

Answer 6

0.001%

Question 7

fertilisation takes place in the … within the birds reproductive tract

Answer 7

infundibium

-If inseminate sperm in uterus it goes all the wayyyyyyyy even if dead sperm

Question 8

sperm mobility is determined by sperm size, with sperm around ..micrometres being the fastest

a .. midpiece and … tail is the most efficient

Answer 8

70

tiny, long

Question 9

15 minutes after the acrosome reaction, the egg secretes …, which glues sperm to the yolk at the outer perivitelline layer
What happens 15 minutes after the acrosome reaction?

Answer 9

glycoproteins

Question 10

by looking at the inner peritiviline layer for … can tell how many sperm reach egg

Answer 10

holes

Question 11

polyspermy massively … fertilisation rates in birds, thanks to the additional .. from sperm

Answer 11

proteins

-japanese birdy fertilised with 1 sperm + proteins from others, took a while though

Question 12

bird reproductive tract goes vagina, .., .., .. and finally infundibium

Answer 12

uterus, ishtmus, magnum