BIO318Y5 Lecture Notes - Lecture 4: Mitochondrion, Sympatric Speciation, Kleptoparasitism
Document Summary
What does a cuckoo bird do: http://www. arkive. org/cuckoo/cuculus-canorus/video-09a. html, beg from worker ants, kleptoparasitism, take from other nests or drop their eggs into other nests, the brutal hatchlings of the cuckoos and push out other hatchlings. Fed by the host bird: some ducks also act as cuckoos amongst their own species, in canada, cowbird is like a cuckoo. The biological environment: case study the cuckoo: linking natural selection to diversification. The eggs of hosts and cuckoos: cuckoo eggs mimic host eggs, other than dunnock. Useless in distinguishing cuckoo and model eggs from its own eggs. Poorly discriminates cuckoo eggs and as a result suffers: host race, cuckoo specialize on a particular host and develop an egg that matches the host, diversity amongst a species; polymorphism. Biological diversification without speciation: can rule out mitochondrion genome. If there is constant inter-breeding, how do host-race adaptations remain distinct: birds have a zw=female, zz=male sex chromosome system.
