DO NOW 12/6

What is biogeography and how does it differ from the fossil record?

FUN FACT FRIDAY

• Peppermints not only give you fresh breath after meals but also aid in digestion.

• Diamonds are in fact not rare or valuable - one company called De Beers restricts the diamond supply, keeping prices high.

• In 1980 a 2.5 GB disk drive was the size of a refrigerator, weighed 550 pounds and cost $40,000.

• Basketball was invented in Canada.• A group of sharks is called a shiver.

HOMOLOGIES• Homologies are likenesses

between something• Inherited from a common ancestor• In the case of evolution, we look

at 3 different types of homologies•Anatomical•Developmental•Genetic

ANATOMICAL HOMOLOGIES

• A structure that is anatomically similar among a group, although it might not have the same function (i.e. used for walking, flying, climbing, etc.)

• Most common comparison is among the forearms of different animals

DEVELOPMENTAL HOMOLOGIES• Embryonic similarities among

organisms of different species • All vertebrates have a distinct

developmental pattern • Some common characteristics• Notochord• Postanal Tail • Pharyngeal pouches• Dorsal Hollow Nerve Cord

GENETIC HOMOLOGIES• DNA/RNA similarities among organisms• Scientists look at the genetic code of an

organism and compare it to that of another organism

• Also looks at amino acid chains – Why?