HW # 83- Vocabulary Booklet (due Friday) HW TOC will be collected FRIDAY 3/15 Complete your notes. Warm up What is the significance of “pie/ π” day? Week 25, Day Three
Warm up Response Pi is a name given to the ratio of the circumference of a circle to the diameter Explained on You tubeYou tube
Homework Response/Check Did you work on your vocabulary booklet?
Evolution Notes
Part 1
Charles Darwin Born in England Traveled around on HMS Beagle - Set Sail in 1831 Collected many specimens Father of the idea of Evolution
Voyage of The Beagle
Darwin & The Galapagos Galapagos Islands are a small group of islands 1000km west of South America Studied Tortoises and Finches on the islands. Used geography of islands and differentiation of species to figure out evolution
Galapagos Islands
Although they were close together, the islands had very different climates. The smallest, lowest islands were hot, dry, and nearly barren. – Hood Island - sparse vegetation. The higher islands had greater rainfall and a different assortment of plants and animals. – Isabela Island - rich vegetation Allowed for different species of the same animal --> formed through evolution!
Galapagos Finches
Galapagos Tortoises
Galapagos Blue-Footed Booby Male dances and shows its feet to the female to attract her Female chooses male with brightest feet and best dance Sexual selection! Sexual selection is a trait or behavior that acts on an organism's ability to obtain a mate
Darwin ’ s Thoughts On his travel home, he began to think of his observations. He found…characteristics of many animals and plants varied noticeably among the different islands of the Galapagos A ccording to this hypothesis, these separate species would have evolved from an original South American ancestor species after becoming isolated from one another
Inherited Variation and Natural Selection Darwin noted that plant and animal breeders used heritable variation, what we now call genetic variation, to improve crops and livestock. Artificial selection: nature provided the variation, and humans selected those variations that they found useful. – A.K.A Selective Breeding
Better Picture of Artificial Selection
Natural Selection Each organism has different advantages and disadvantages – Individual best suited for environment survive and REPRODUCE – Pass these traits onto offspring, and they are more able to survive and reproduce Occurs only when a few survive Remember: differences (genes) in offspring occur at random!
Darwin ’ s Concept of Evolution Biggest contribution is his idea of the mechanism behind Evolution – The Struggle for Existence – Survival of the Fittest – Descent with Modification
Struggle For Existence Struggle for existence: means that members of each species compete regularly to obtain food, living space, and other necessities of life. –Predators that are faster win –Prey that are better camouflaged or protected win
Survival of the Fittest Fitness: ability of an individual to survive and reproduce in its specific environment. – Result of adaptations Adaptation: any inherited characteristic that increases an organisms chance of survival
Survival of the Fittest Survival of the Fittest: the idea that individuals that are better suited to their environment survive and reproduce more successfully – A.K.A. Natural selection
Descent with Modification Natural selection produces organisms that have different structures Descent with modification: each living species has descended, with changes, from other species over time