BIOL10004 Lecture Notes - Lecture 19: Asexual Reproduction, Egg Cell, Gamete

36 views3 pages
Semester 1, 2018 Sam Midler
BIOL Lecture 19
Reproduction I
Asexual reproduction
mitotic cell division
offspring genetically identical to parents
o no exchange of genetic material
allows a single individual to produce a colony
o corals, hydra (budding), sea stars (fragmentation)
common among invertebrates but also some vertebrates
o stream fish, some geckos, snakes and sharks
advantageous for animals living in constant, stable environments
parthenogenesis occurs through use of ova and the female reproductive system
o process where an egg develops without being fertilised
also occurs in fluctuating environments
facultative parthenogenesis use asexual or sexual reproduction depending on
environment, food resources and mate availability
sexual reproduction
exchange of genetic information
common strategy among both invertebrates and vertebrates
needs two sexes female / male
o female: produce a few large gametes (eggs) non-motile, contribute all
cytoplasm and DNA embryo
o male: produce many small gametes (Sperm) motile, usually only contribute
mitosis and meiosis
o somatic cell division
o no exchange or genetic material
o asexual reproduction
o specialised form of cell division
o haploid (1n) gametes fuse to
form a new diploid (2n) individual
o sexual reproduction
sexual reproduction requires
mechanisms to get sperm and egg
together fertilisation
o offspring a combination of
find more resources at
find more resources at
Unlock document

This preview shows page 1 of the document.
Unlock all 3 pages and 3 million more documents.

Already have an account? Log in

Get access

Grade+20% off
$8 USD/m$10 USD/m
Billed $96 USD annually
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
40 Verified Answers
$8 USD/m
Billed $96 USD annually
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
30 Verified Answers

Related Documents