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AP Biology Evolution :)

A consideration of AP Biology from the master perspective of cross-cutting themes (concepts).
by

Tatiana Bojorquez

on 1 March 2011

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Transcript of AP Biology Evolution :)

Relationship of Structure to Function— 2. Major features of the genetic code are shared by all contemporaryliving systems.
c. Conditions for a population to be in Hardy-Weinberg equilibrium are: 1.C.1 Speciation and extinction have occurred throughout the Earth’s history. b. Changes in DNA occur during essential cellular processes, in particular, DNA replication, repair, and recombination. These changes may be silent with no observable phenotypic effects; or these changes can significantly alter the phenotype of the organism to increase or decrease fitness. Students should be able to demonstrate understanding of the above concept by using an illustrative example such as: Sickle cell
4) random mating a. Genetic drift is a nonselective
process occurring in small populations. 1.A. Change in the genetic makeup
of a population over time is evolution. 1. DNA and RNA are
carriers of genetic information. 1.B. Organisms are linked by lines of descent from common ancestry. 1) a large population size 1.C. Life continues to evolve within a
changing environment. 1.A.2 Natural selection acts on phenotypic variations in populations. 1.B.1 Organisms share many conserved core processes and features that evolved and are widely distributed among organisms today. a. Structural and functional evidence supports
the relatedness of all domains. Evidence of student learning is a demonstrated understanding of the following concepts: Learning Objective: The student uses data from mathematical computer models based on the HW-equilibrium to analyze genetic drift and artificial selection in the evolution of specific populations. Learning Objective: The student is able to make predictions about the effects of genetic drift on the genetic makeup of a population. d. Artificial selection by humans has resulted in a wide variety of pets, livestock and crops. 5) absence of selection.
These conditions are seldom
completely met. Hardy-Weinberg
mathematical models can be used
to determine allele frequencies. b. Speciation rates may vary, especially
when adaptive radiation occurs following mass extinctions when new habitats are available. 3) no net mutations 1.A.3 Evolutionary change is also driven by genetic drift and artificial selection. b. Reduction of genetic
variation within a given population
may increase variation among populations. a. Extinction rates are rapid at times of ecological stress. 2) absence of migration a. Variations are not directed
by the environment but occur through
random changes in the DNA and
through new gene combinations. Selection Evolution is the biological change of organisms that occurs over time and is driven by the process of natural selection. Evolution accounts for the diversity of life on Earth. Evolution— d. An adaptation is a genetic
variation that is favored by selection
and is manifested as a trait that
provides an advantage to an organism
in a particular environment. e. A diverse gene pool is
important for the survival of a species in a changing environment. 1.A.1 Natural selection is a major mechanism of evolution. c. Environments can be
more or less stable or fluctuating,
and this affects evolutionary rate and
direction; different genetic variations
may be selected in every generation. b. Changes in DNA occur during essential cellular processes, in particular, DNA replication, repair, and recombination. These changes may be silent with no observable phenotypic effects; or these changes can significantly alter the phenotype of the organism to increase or decrease fitness. Students should be able to demonstrate understanding of the above concept by using an illustrative example such as: c. Evidence provided by the
fossil record and biochemical and genetic similarities supports speciation. Sickle cell
b. New species arise from
reproductive isolation over time which may involve scales of hundreds of thousands or millions of years or be as rapid as one generation. Yellow mice 1.A.2 Natural selection acts on phenotypic variations in populations. a. Variations are not directed
by the environment but occur through
random changes in the DNA and
through new gene combinations. b. Reduction of genetic
variation within a given population
may increase variation among populations. a. According to Darwin’s
Theory of Natural Selection,
evolutionary fitness is measured
by reproductive success. 1.C.2 Speciation may occur when two populations become reproductively isolated from each other. 1.A. Change in the genetic makeup
of a population over time is evolution. Evolutionary change is also driven by genetic drift and artificial selection. a. Speciation results in diversity
of life forms. If species are not physically separated by a geographic barrier such as an ocean or mountain range, various pre-and post-zygotic mechanisms maintain reproductive isolation and prevent gene flow. 1.C. Life continues to evolve within a
changing environment. b. Genetic variation play roles in natural selection. a. Genetic drift is a nonselective
process occurring in small populations. Natural
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