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The Pattern of Evolution
aYThe first scientist to give a definition of species, John Ray, states that ͙͞[O]ne species never
springs from the seed of another.͟
aYThe Theory of Special Creation had been the leading explanation in Europe for the origin of
species until a certain point where scholars began to challenge that notion (i.e. when Darwin
started to study biology seriously) and research in biology and geology grew rapidly to disprove
the theory.
aYDarwin drew up evidence suggesting that the pattern of life͛s history is different than is claimed
by Special Creation. (Read Page 39 for elaboration)
1.YSpecies are not immutable, but change through time
2.YSpecies are derived not independently, but from common ancestors
3.YThe Earth and life are considerably more than 6 000 years old.
aYDarwin also introduced a process to explain this pattern called natural selection
÷Y
Evidence from Living Species
aYThe living evidence for descent with modification comes in two forms:
OYcy monitoring natural populations, we can directly observe small scale change (i.e.
^)
OYf we examine the bodies of living organisms, we can find evidence of dramatic change
(i.e. ^)
aYÿ
OYRead examples of the change of the Soapberry bug over time on Page 40
aY·
OYÎ vestigial structure is a useless or rudimentary vision of a body part that has an
important function in other, closely allied species (e.g. the remnant hind limbs on the
rubber boa).
OYåumans have muscles attached to the hair follicles that make hair stand up when cold,
intimidated, or needed to seem bigger. These muscles are effective for animals that are
very hairy like chimpanzees. Most of us are not that hairy (except some of you hormone
excessive freaks), and thus the result of these muscles contracting is goose bumps. This
implies that we descended from ancestors who were hairier than us.
OYRead page 42 for more examples
OY·estigial traits also occur at a molecular level.
XYåumans have one on chromosome 6; a DNÎ sequence that looks like a gene for
the enzyme CMÎå
XYt is actually disabled by a 92-base-pair deletion and humans cannot
manufacture CMÎå
XYChimpanzees however are able to
XYThis explains that the human race must have descended from a common
ancestor with the chimpanzees
OYRead page 43 for more examples
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Document Summary

Bgyb51: chapter 2 (pages 37 49 and 53 65) Evidence from living species y the living evidence for descent with modification comes in two forms: by monitoring natural populations, we can directly observe small scale change (i. e. microevolution) These muscles are effective for animals that are very hairy like chimpanzees. Most of us are not that hairy (except some of you hormone excessive freaks), and thus the result of these muscles contracting is goose bumps. This implies that we descended from ancestors who were hairier than us: read page 42 for more examples, vestigial traits also occur at a molecular level.  humans have one on chromosome 6; a dna sequence that looks like a gene for the enzyme cmah. It is actually disabled by a 92-base-pair deletion and humans cannot manufacture cmah.  this explains that the human race must have descended from a common ancestor with the chimpanzees: read page 43 for more examples.

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