Topic 5h - Animal repro. & dev. Flashcards Preview

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Flashcards in Topic 5h - Animal repro. & dev. Deck (13):
1

Various forms of asexual repro...

budding
regeneration after fission
parthenogenesis

2

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

meiotic division of germ cells

3

How many sperm produced per day?

100 million

4

Acrosome contains ...?

digestive enzymes

5

What is oogenesis?

production of eggs
occurs in ovaries

6

When does oogenesis begin?

during embryonic development of the female

7

Re fertilisation, sperm swim up ...?

fallopian tubes

8

Re fertilisation, entry of sperm triggers...?

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

9

What is indirect dev?

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

10

What is direct dev?

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

11

Cleavage of zygote forms ...?

morula

12

What is the site where gastrulation begins?

blastopore (mesoderm)

13

What does the endoderm form...?

primitive gut