23 Did you THINK about it? Did you write down all your Guesses? IF SO: CLICK!!!!
24 Embryology Studies The organisms are: –Fish –Salamander –Chicken –Rabbit –Human –Why would these five, so different looking organisms at birth, look so similar before birth?
25 More about embryological studies
26 EVIDENCE FROM BIOCHEMISTRY
27 Studies of Biochemistry SpeciesSequence of Amino Acids in the Same part of the Hemoglobin Molecule HumanLys-Glu-His-Iso HorseArg-Lys-His-Lys GorillaLys-Glu-His-Lys ChimpanzeeLys-Glu-His-Iso ZebraArg-Lys-His-Arg
28 Which organisms appear to be more closely related to each other? Human and chimpanzee have no differences in their amino acid sequence suggesting their close evolutionary relationship, they have a more recent common ancestor. Studies of other chemicals, like proteins used in digestion, show similar comparisons in these organisms.
29 EVIDENCE FROM DNA From studies of DNA
30 DNA The sequence of the nucleotides making up their DNA would also be similar because DNA determines the sequence of amino acids in proteins. From studies of DNA
31 DIRECT OBSERVATION OF EVOLUTION OCCURRING IN MODERN DAY ORGANISMS From observation
32 Observations of Evolution in modern organisms Mosquitoes resistance to insecticides Bacteria resistance to antibiotics New strains of Plasmodium that cause Malaria New strains of TB (tuberculosis) Peppered moth Darwin finches
33 Has and Does Evolution Occur? Scientists do not dispute that evolution does occur. Evolution is a FACT. How evolution occurs is not completely understood. Charles Darwin explained how evolution occurred through natural selection. Natural selection is a well documented THEORY uniting all of biology. Modern evolutionary theory uses ideas of genetics, particularly mutations, to help explain how evolution may occur. (Darwin didn’t know about mutations.)