Natural Selection and the Theory of Evolution NATURAL

Natural Selection and the Theory of Evolution

NATURAL SELECTION: the process in which organisms inherit advantageous traits tend to reproduce more successfully • Overproduction- Large population, only a small amount will survive to adulthood (reproduction age) • Genetic Variation- Variety and Uniqueness to individuals in the population • Selection- Some individuals have traits that are important for survival • Adaptation- an inherited trait which helps organisms survive NATURAL SELECTION GAME: 4 corners (p. 482)

ADAPTATION Characteristic of an organism which I increases it’s chances for survival Could be physical or behavioral

What are LIMITING factors!? Make a quick list of factors that limit species survival • • Food Shelter Water Space Disease Parasitism Predation Nesting Sites

What if my species cant adapt? • EXTINCTION: all the members of a species die out

EVOLUTION: the process in which species change over time

Darwin’s Theory of Evolution (via Natural Selection) Darwin’s Finch Experiments on the Galapagos Island (HMS BEAGLE) “Survival of the fittest” https: //www. youtube. com /watch? v=Bcp. B_986 wyk

What evidence supports the Theory of Evolution? https: //www. youtube. com/watch? v=l. IEo. O 5 Kd. Pvg Fossil Record Transitional fossils Common structures Similar DNA Embryology

THE FOSSIL RECORD: order of fossils within the strata of sedimentary rock Fossils: preserved remains of dead organisms The older fossils are further down Relative dating: strata shows the age

Transitional fossils: fossils that show intermediaries of species • Tiktaalik

Common Structures

Similar DNA • Organisms with fewer amino Acid differences are more closely Related. *Cytochrome C houses proteins and Amino acids used in respiration

Developmental Similarities EMBRYOLOGY Due to a common ancestor?

BINOMIAL n. OMENCLATURE: 2 name system • FIRST WORD IS THE GENUS and it is CAPITALIZED • SECOND IS THE SPECIES and it is lowercased • Must be underlined or in italic • Ex: Homo sapiens • Ex: Octodon degus

Cladogram

DICHOTOMOUS KEY • Create your own dichotomous key using 4 household items!

Evolution Summed up: https: //www. youtube. com/watch? v=Cn. De. Id. Qcw. G 0