Flashcards in Topic 5h - Animal repro. & dev. Deck (13):
Various forms of asexual repro...
regeneration after fission
Gametogenesis (formation of sperm & eggs) is the result of ...?
meiotic division of germ cells
How many sperm produced per day?
Acrosome contains ...?
What is oogenesis?
production of eggs
occurs in ovaries
When does oogenesis begin?
during embryonic development of the female
Re fertilisation, sperm swim up ...?
Re fertilisation, entry of sperm triggers...?
resumption of meiosis (nucleus of egg & nucleus of sperm)
What is indirect dev?
Immature often bears no resemblance to adult
mainly in amphibians & invertebrates
lots of eggs produced
immature to adult via METAMORPHOSIS
What is direct dev?
Immature resembles adult
require more nourishment
eggs provisioned with yolk
embryos incubated inside females body
survivorship to adulthood much higher
Cleavage of zygote forms ...?
What is the site where gastrulation begins?