Warm up: Define evolution. Explain how the graphic below shows the evolution of
the web browsing
4Genetic
variation and assortment
Evolution and reproduction
3Events of meiosis,
variation and reproduction
2Steps of
meiosis basic definitions
1Mitosis vs
meiosis, sexual vsasexual
Learning goal: Assess their understanding of meiosis, genetics, evolution and population ecology
Page 58Thursday February 26, 2015
Learning goal: Assess their understanding of meiosis, genetics, evolution and population ecology
Learning scale:
Student’s self-evaluation: Complete at home or at the end of class, use the
4-3-2-1 Learning scale (two to three sentences).
Homework: Study for Quiz 27.
1 2 3 4
Differentiatebetween
mitosis and meiosis, sexual
and asexual reproduction.
Define spermatogenesis
and oogenesis. Listthe steps to
meiosis.Define sexual and
asexual reproduction.
Summarize the events the occur during
meiosis. Differentiate between sexual and asexual reproduction and the correlation of
genetic variation.
Explain how genetic variation is a function of
crossing-over and independent assortment
during spermatogenesis and oogenesis. Evaluate the genetic and evolutionary
advantages to sexual versus asexual reproduction.
4Genetic
variation and assortment
Evolution and reproduction
3Events of meiosis,
variation and reproduction
2Steps of
meiosis basic definitions
1Mitosis vs
meiosis, sexual vsasexual
Learning goal: Assess their understanding of meiosis, genetics, evolution and population ecology
Page 58Thursday February 26, 2015
4Genetic
variation and assortment
Evolution and reproduction
3Events of meiosis,
variation and reproduction
2Steps of
meiosis basic definitions
1Mitosis vs
meiosis, sexual vsasexual
Learning goal: Assess their understanding of meiosis, genetics, evolution and population ecology
Evolution is an explanation of how a population changes over time
Before evolution: Jean Baptiste Lamarack (1744-1829)
Lamarack suggest traits of an individual organism change over time through use.
Page 59Thursday February 26, 2015
4Genetic
variation and assortment
Evolution and reproduction
3Events of meiosis,
variation and reproduction
2Steps of
meiosis basic definitions
1Mitosis vs
meiosis, sexual vsasexual
Learning goal: Assess their understanding of meiosis, genetics, evolution and population ecology
Evolution is an explanation of how a population changes over time
The Fossil record
Examination of fossils show gradual changes in species over time
Page 59Thursday February 26, 2015
Modern
horse
“Darwin”
horse
4Genetic
variation and assortment
Evolution and reproduction
3Events of meiosis,
variation and reproduction
2Steps of
meiosis basic definitions
1Mitosis vs
meiosis, sexual vsasexual
Learning goal: Assess their understanding of meiosis, genetics, evolution and population ecology
Page 59Thursday February 26, 2015
Questions to aid in evolution:
1. Give two similarities between each of the
skulls that might lead to the conclusion that
these are all related species.
2. What is the biggest change in skull anatomy
that occurred from the dawn horse to the
modern horse?
3. What is the biggest change in leg anatomy
that occurred from the dawn horse to the
modern horse? Modern
horse
“Darwin”
horse
4Genetic
variation and assortment
Evolution and reproduction
3Events of meiosis,
variation and reproduction
2Steps of
meiosis basic definitions
1Mitosis vs
meiosis, sexual vsasexual
Learning goal: Assess their understanding of meiosis, genetics, evolution and population ecology
Page 59Thursday February 26, 2015
Embryology: the study of embryos to support the theory of evolution
Hypothesize which embryo is
from each of the following
organisms:
4Genetic
variation and assortment
Evolution and reproduction
3Events of meiosis,
variation and reproduction
2Steps of
meiosis basic definitions
1Mitosis vs
meiosis, sexual vsasexual
Learning goal: Assess their understanding of meiosis, genetics, evolution and population ecology
Page 59Thursday February 26, 2015
Embryology: the study of embryos to support the theory of evolution
Hypothesize which embryo is
from each of the following
organisms:
A B C D E F
4Genetic
variation and assortment
Evolution and reproduction
3Events of meiosis,
variation and reproduction
2Steps of
meiosis basic definitions
1Mitosis vs
meiosis, sexual vsasexual
Learning goal: Assess their understanding of meiosis, genetics, evolution and population ecology
Page 60Thursday February 26, 2015
Homologous structures: structures that share a common ancestor.
What two organisms are these two bone structures found in?
humors
ulna
radius
carpal
metacarpal
phalanges
4Genetic
variation and assortment
Evolution and reproduction
3Events of meiosis,
variation and reproduction
2Steps of
meiosis basic definitions
1Mitosis vs
meiosis, sexual vsasexual
Learning goal: Assess their understanding of meiosis, genetics, evolution and population ecology
Page 60Thursday February 26, 2015
Structures versus function
What suggests a closer relation: the structure or function of a trait?
These wings are analogous structures: similar function with different anatomies
Butterfly wing
Bird wing
4Genetic
variation and assortment
Evolution and reproduction
3Events of meiosis,
variation and reproduction
2Steps of
meiosis basic definitions
1Mitosis vs
meiosis, sexual vsasexual
Learning goal: Assess their understanding of meiosis, genetics, evolution and population ecology
Page 60Thursday February 26, 2015
Vestigial structures: structures an organism has but no longer uses, suggesting
a common ancestry
4Genetic
variation and assortment
Evolution and reproduction
3Events of meiosis,
variation and reproduction
2Steps of
meiosis basic definitions
1Mitosis vs
meiosis, sexual vsasexual
Learning goal: Assess their understanding of meiosis, genetics, evolution and population ecology
Page 61Thursday February 26, 2015
Evolution (change) from a common ancestor
Natural selection allows an environment to dictate the amount of and type of
change that occurs
Individuals best for an environment will survive the longest and
reproduce the most
Factors in natural selection
1. Genetic variation is present in populations
2. Challenges to survival and reproduction exist in an environment
3. Individuals in a population must compete for resources
4. Individuals who can out compete others will survive and reproduce, passing
their traits to the next generation
As natural selection occurs populations will diverge as differences accumulate
4Genetic
variation and assortment
Evolution and reproduction
3Events of meiosis,
variation and reproduction
2Steps of
meiosis basic definitions
1Mitosis vs
meiosis, sexual vsasexual
Learning goal: Assess their understanding of meiosis, genetics, evolution and population ecology
Page 61Thursday February 26, 2015
Divergence: the continued
evolution (change) of a species
over time that leads to the
formation of a new species. This
was seen in the evolution of
salamander in California
The salamanders, traveling south,
accumulated differences from
various forms of natural selection
occurring different environments
Ultimately the differences became
so great a new species will be
created. This process, the
creation of a new species is know
as Speciation