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