Topic 5h - Animal repro. & dev.

Question 1

Various forms of asexual repro…

Answer 1

budding
regeneration after fission
parthenogenesis

Question 2

Gametogenesis (formation of sperm & eggs) is the result of …?

Answer 2

meiotic division of germ cells

Question 3

How many sperm produced per day?

Answer 3

100 million

Question 4

Acrosome contains …?

Answer 4

digestive enzymes

Question 5

What is oogenesis?

Answer 5

production of eggs

occurs in ovaries

Question 6

When does oogenesis begin?

Answer 6

during embryonic development of the female

Question 7

Re fertilisation, sperm swim up …?

Answer 7

fallopian tubes

Question 8

Re fertilisation, entry of sperm triggers…?

Answer 8

resumption of meiosis (nucleus of egg & nucleus of sperm)

Question 9

What is indirect dev?

Answer 9

Immature often bears no resemblance to adult
mainly in amphibians & invertebrates
lots of eggs produced
immature to adult via METAMORPHOSIS

Question 10

What is direct dev?

Answer 10

Immature resembles adult
require more nourishment
eggs provisioned with yolk
embryos incubated inside females body
survivorship to adulthood much higher

Question 11

Cleavage of zygote forms …?

Answer 11

morula

Question 12

What is the site where gastrulation begins?

Answer 12

blastopore (mesoderm)

Question 13

What does the endoderm form…?

Answer 13

primitive gut