Download Embryo-4

1. Describe embryonic development as evidence for evolution
2. Determine how the amino acid sequence found within the DNA
of organisms can help trace their relationships with one another
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SPECIES PAIRINGS
HUMAN – CHIMPANZEE
HUMAN – FRUIT FRY
HUMAN – HORSE
HUMAN – PIGEON
HUMAN – RATTLESNAKE
HUMAN – RED BREAD MOLD
HUMAN – RHESUS MONKEY
HUMAN – SCREWROM FLY
HUMAN – SNAPPING TURTLE
HUMAN – TUNA FISH
HUMAN – WHEAT
NUMBER OF DIFFERENCES IN
AMINO ACID
0
29
12
12
14
48
1
27
15
21
43
The greater the similarity present in the amino acid
sequence, the closer the relationship is among the
organisms. Also, organisms with similar structures and
biochemical compositions could have probably
descended from a common ancestor.
1. Given in the next page are the amino acid
sequences found in the cytochrome C of a human,
chimpanzee, gorilla, Rhesus monkey, horse, and
kangaroo.
Cytochrome C is a respiratory enzyme located
inside the mitochondria.
2. First, study carefully these sequences in Table 1.
3. Next, supply the missing amino acid
sequence of the chimpanzee, gorilla, Rhesus
monkey, horse, and kangaroo to complete
Tables 2, 3, and 4.
Refer to Table 1 for your answers.
4. Afterward, identify the differences of the
amino
acid
sequences
among
these
organisms. Use the human’s amino acid
sequence as your reference.
5. Finally, complete Table 5 to show the
differences in the number of amino acids and
the positions in which they vary.
TABLE 1
TABLE 2
TABLE 3
TABLE 4
TABLE 5
THEORIES OF
EVOLUTION
• First evolutionist to believe
that organisms change over
time
• Used fossil records as guide to
develop three theories:
1.THEORY OF NEED
2.THEORY OF USE AND
DISUSE
3.THEORY OF ACQUIRED
CHARACTERISTICS
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• THEORY OF EVOLUTION
• THEORY OF NATURAL
SELECTION
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1. Embryo is an early stage
of development in
organisms.
2. Charles Darwin
developed The Theory of
Need.
3. Jean Baptiste de Lamarck
developed the Theory of
Use and Disuse.
4. The greater the similarity
present in the amino acid
sequence, the farther the
relationship is among the
organisms.
5. The organism closest to
humans is Kangaroo.