Dan Ebner Bill Notes - Bio Notes Start from Charles Darwin...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Bio Notes – Start from Charles Darwin on Galapagos Charles Darwin on Galapagos 1 Encountered the strange animals – rodent hare, etc 2 Darwin’s Finches o Around 13 species, studied extensively o Birds were related to each other in some way – shared a common ancestry o Major differences between finches Shape and size of bill/ beak, smaller and larger, slightly different shapes Foraging Behavior – insect eaters, plant eaters, combinations of both Warbler – needle like bill, eats insects…plant eaters have much larger bills – feeds in the upper parts of trees Tool Using Finch – woodpecker finch – example in the animal kingdom of an individual - who uses a tool in its everyday activities, uses cactus or other spines to look for insects ( Woodpecker has a large thin tongue that has spines on it, just inhales the grubs ) – the Tool Using Finch uses the spine to extract the grubs. ( Secretary Bird uses stones to break Ostrich eggs to eat them, Seagull (gulls) dropped clams from high heights to break them ) Darwin back to England – 1936 -27 years old 2 Major Questions – how did animals change? o Already knew the species were not immutable but changed over time 3 Journal o Transmutation of Species – touched on some form of natural selection 4 Ran back to Shrewsbury o Went back to see Emma at his Uncle’s house, married Emma later, bore him 10 children over a 16 year period 5 Continuing Question o Went out and discussed his ideas with other biologists ( Pigeon compared to other varieties of pigeons – actually a process of inbreeding because they kept the same “families” of pigeons or other birds/animals together for a large period of time Artificial Selection ) Artificial Selection – breeders take similar, appealing birds and have them breed together to make better looking birds. (Labrador Retrievers – joints become arthritic because the back legs are weak – most likely a result of inbreeding) After seeing Artificial Selection, began to see something in Natural Selection o Thomas Robert Malthus Darwin read an Essay on the Principles of Population
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Malthus indicated that he was concerned that people would eventually breed beyond the possible food supplies – tried to find an arithmetic equation for that occurrence o Arithmetic progression – the food increases arithmetically (2, 4, 6, 8, 10…) o Geometric progression – people increasing geometrically (2,4,8,16,32,64…) o Eventually following the equations people would surpass the amount of food – food would control population o Bubonic Plague – 70 million people died – another control through pestilence o War – native tribe, 80 – 100 people, grow a little food, eat animals…another little tribe nearby, suddenly had a growth spurt, jumping from 100 to 150 or 200 – they steal from the first tribe, they run out of food, they go out and fight, some people die, and the population goes back to a placid lifestyle. Vietnam – 60,000 Americans died
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 62

Dan Ebner Bill Notes - Bio Notes Start from Charles Darwin...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online