Evolution: it’s all about mutations that aid survival and reproductive selection

Darwin and his evidences for evolution

Darwin’s Evidences of evolution (15-3)

• First, review key ideas/terms:– Struggle for existence– Survival of the fittest• Fitness• Adaptation• Natural selection

– Descent with modification

Evidence #1 (of 4)

The fossil record shows transitional forms of organism– Deeper you go down, older the organism is– Ex.: ?

http://www.google.com/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&cad=rja&docid=1aolEAOKJg3UPM&tbnid=wKmNb_KOuyUFbM:&ved=0CAUQjRw&url=http://bio1903.nicerweb.com/Locked/media/ch22/transitional.html&ei=3YdZUb_HKejo0wG-qoHIDQ&bvm=bv.44442042,d.dmQ&psig=AFQjCNG4p28EBEHLeIAU8xBcH5jjVddlgA&ust=1364908329385119

Evidence #2 (of 4)

The geographic distribution of living species shows descent with modification of organisms– Organisms with different ancestors look/behave

similarly if from similar environment– Ex.: ?

http://www.google.com/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&cad=rja&docid=L3XaqCLYpU1zSM&tbnid=kwnaX-AB5OlMvM:&ved=0CAUQjRw&url=http://jfk-science-wiki.wikispaces.com/Geographic+Distribution+of+Living+Species&ei=AohZUYu3PKux0QGgv4G4Bw&bvm=bv.44442042,d.dmQ&psig=AFQjCNFvYN7t8XR1CxNMvoFyhUTGM6Au4g&ust=1364908409960532

Evidence #3 (of 4)

Homologous structures show similarities in body parts with very different uses– Ex.: ?

– Some structures may no longer have function, called vestigial organs

– Ex.: ?

http://www.google.com/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&cad=rja&docid=zXpPFEPQAXfByM&tbnid=PT-l9wTUazr2JM:&ved=0CAUQjRw&url=http://bio1151.nicerweb.com/Locked/src/chap22_q.html&ei=pIhZUb_sBurc0QHvs4HgDw&bvm=bv.44442042,d.dmQ&psig=AFQjCNEF46sN8fgp4JrcassnhWKwP0jSVA&ust=1364908559647847

http://www.google.com/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&cad=rja&docid=OSjL722VzHFSIM&tbnid=NOMitDdGEqkyuM:&ved=0CAUQjRw&url=http://www.glogster.com/old/view?nickname=posterproject&title=vestigial-structures/&ei=W4lZUcbuF-uz0QGRr4H4Dw&bvm=bv.44442042,d.dmQ&psig=AFQjCNHt8JnmvuH7rb85LoKSRiOSK-p9lg&ust=1364908676227944

http://www.google.com/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&cad=rja&docid=OSjL722VzHFSIM&tbnid=NOMitDdGEqkyuM:&ved=0CAUQjRw&url=http://www.glogster.com/old/view?nickname=posterproject&title=vestigial-structures/&ei=W4lZUcbuF-uz0QGRr4H4Dw&bvm=bv.44442042,d.dmQ&psig=AFQjCNHt8JnmvuH7rb85LoKSRiOSK-p9lg&ust=1364908676227944

Evidence #4 (of 4)

Similarities in early development shows how we all come from the same embryonic cells, in the same pattern– What does this imply?– Ex.:

Which is the human embryo?

Which is the human embryo?

http://www.google.com/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&cad=rja&docid=7VViLS3a0A9zrM&tbnid=QUHP0Fl1OSfvwM:&ved=0CAUQjRw&url=http://community.xat.com/showthread.php?16612-Evolution-How-is-it-science&ei=WIpZUYzpA4KA0AGZgYGABA&psig=AFQjCNG4Fb3PyHAPvc4JI0p907roTbHeFA&ust=1364908951793723