Opener, Wed., Nov. 16th

Watch the video, write down your observations!!

• http://www.arkive.org/ground-pangolin/smutsia-temminckii/video-00.html

10.3 KEY CONCEPT 10.3 KEY CONCEPT Darwin proposed natural selection as a Darwin proposed natural selection as a

mechanismmechanism for evolution!! for evolution!!

11-16-201011-16-2010

EOC Practice questions, p. EOC Practice questions, p. 541541

• 1-6, multiple choice1-6, multiple choice

Darwin noticed some cool stuff!!!Darwin noticed some cool stuff!!!

process by which humans select traits through breeding!

neck feathers

crop

tail feathers

• ability of a trait to be passed down.ability of a trait to be passed down.• struggle for survival (struggle for survival ())• Darwin proposed: adaptations Darwin proposed: adaptations

arose over arose over many generationsmany generations

• Due to overpopulation & Due to overpopulation & limited resources! limited resources!

• Survive & Reproduce…Survive & Reproduce…

(() Pass on traits) Pass on traits

• mechanism by which mechanism by which individuals that inherited individuals that inherited beneficial adaptations beneficial adaptations produce produce more offspring more offspring (on avg) than other (on avg) than other individualsindividuals

• 4 main principles to the theory of natural selection.– variation

Natural selection explains how evolution can occur.

– overproduction

– adaptation– descent with modification

VARIATION

OVERPRODUCTION

ADAPTATION

• Fitness is the measure of survival ability and ability to produce more offspring.

DESCENT withMODIFICATION

• Natural selection can act only on traits that already exist.• Structures take on new functions in addition to their

original function.

Natural selection acts on existing variation.

wrist bone

five digits

4 Main principles of Natural Selection . . . 4 Main principles of Natural Selection . . . . . .. . .

heritablheritable e differendifferences that ces that exist in exist in EVERY EVERY pop are pop are the the basis basis for NSfor NS

Having Having many many offspring offspring increases increases chance of chance of survival, survival, BUT also BUT also increases increases competitiocompetitionn

A certain A certain variation variation that that allows allows one to one to survive survive better better than than others it others it competes competes againstagainst

Heritability of adaptations!!More will have the traits in every following generation, as long as conditions remain beneficial!!

Happy Monday!

Today’s opener = grade your Practice EOC

Remember, only 14 days until BIO EOC!!

Quiz tomorrow—Quiz tomorrow—

Ch 17, Ch 10—Ch 17, Ch 10—

vocab, Ch Review and Study Guide DUE!vocab, Ch Review and Study Guide DUE!

10.4 KEY CONCEPT 10.4 KEY CONCEPT Evidence of common ancestry among Evidence of common ancestry among species comes from many sources.species comes from many sources.

Evidence for evolution in Darwin’s time came from several sources!!!

• Fossils in older Fossils in older layers are layers are more more primitive primitive than than those in the upper those in the upper layers.layers.

– island species most closely island species most closely resemble nearest mainland resemble nearest mainland speciesspecies

– populations can show populations can show variation from one island to variation from one island to anotheranother

•identical larvae, different adult identical larvae, different adult body formsbody forms

•similar embryos, diverse similar embryos, diverse organismsorganisms

Larva

Adult barnacleAdult crab

• similar embryos, diverse organisms

Comparative EmbryologyComparative Embryology

Study of structuresStudy of structures

Human hand Bat wingMole foot

•similar in structure but similar in structure but different in functiondifferent in function•evidence of a common evidence of a common ancestorancestor

• remnants of organs or structures that had a function in an early ancestor.

• Ex: Ostrich wings

Structural patterns also give us clues!!!Structural patterns also give us clues!!!

http://www.livescience.com/animals/top10_vestigial_organs.html

Check this out!!Check this out!!

Bat wing

Fly wing

– similar function but DIFFERENT structure

– Organisms NOT from a recent common ancestor.

MOUSE & OWL ActivityMOUSE & OWL Activity

• groups of 3-4• p. 315• FOLLOW the directions• Answer the ?s @ the end

• 1 person = data recorder, others are “owls”– Copy the data table from the book

http://www.pbs.org/cgi-registry/2wgbh/evolution/library/search.cgi

• Let’s watch a little more video, while you FINISH your cards for teacher appreciation week

• Remember…ANY teacher past or present, that you’d like to say ‘thanks’ to or let them know how much they’ve helped you, etc.– FoJo, JIMS too if you want!