BIOL1003 Lecture Notes - Lecture 7: Wolverine, August Weismann, Comparative Anatomy
Lecture 7
Sexual selection
• Males are usually more decorated or have weapons —> these animals attract females
Evolution after Darwin
• 1895- Origin of Species
• 1860s- Common ancestry widely accepted; Natural Selection becomes an important
idea but many debates over details
• Alfred Russel Wallace
◦ Published a paper very similar to Darwin’s, known as the father of
biogeography
◦ Wallace’s line- divides Australia flora and fauna from Asian fauna and flora
• Haeckel
◦ Good:
◦ Invented: phylogeny, ecology, phylum
◦ Amazing illustrator and comparative anatomist
◦ First real ‘trees of life’ (like
◦ Bad:
◦ polygenism (human races evolved from different species) —> monogenism is
correct, we are all very closely related and evolved form the same
species
◦ Racial classifications of humans, eugenics
◦ Over generalisation —> embryos mimic evolution
• August Weismann
◦ Believed gemmules came from every part of the body, fused in the reproductive
organs —> Lamarckian
◦ Distinguished between: somatic cells, germ cells, somatic cells descend from
germ cells but not the other way
• Lamarck
◦ Invented the word biology
◦ Inheritance of acquired characteristics seems to be not a thing
◦ Usually a press report on it each year —> usually mistakes or exaggerations
◦ Where does variation come from
◦ Mutations
Modern synthesis
• Natural selection is the dominant process
• Biology is functionalist- most things have function; adaptation
• Speciation os mostly allopathic (geographic)
• Advanced debates
◦ Speciation- allopatric (geographic) separation
Lecture 8
• Sexual selection
Very evident in species with competition for females
find more resources at oneclass.com
find more resources at oneclass.com
Document Summary
Sexual selection: males are usually more decorated or have weapons > these animals attract females. Evolution after darwin: 1895- origin of species, 1860s- common ancestry widely accepted; natural selection becomes an important idea but many debates over details, alfred russel wallace biogeography. Published a paper very similar to darwin"s, known as the father of. Wallace"s line- divides australia flora and fauna from asian fauna and flora: haeckel, august weismann. Bad: polygenism (human races evolved from different species) > monogenism is correct, we are all very closely related and evolved form the same species. Believed gemmules came from every part of the body, fused in the reproductive. Distinguished between: somatic cells, germ cells, somatic cells descend from organs > lamarckian germ cells but not the other way. Inheritance of acquired characteristics seems to be not a thing. Usually a press report on it each year > usually mistakes or exaggerations.
