Chapter 9 – Software Evolution Lecture 1 Chapter 9 Software evolution1.
Unit 2: Evolution Lesson # 9: Evidence for...
Transcript of Unit 2: Evolution Lesson # 9: Evidence for...
Unit 2: Evolution
Lesson # 9: Evidence for Evolution
Time for a Refresher
• What is the long, slow process of change in a species over time?
• A _________ is a group of similar looking organisms that breed with each other and produce fertile offspring make up a population.
• ___ ____ is the survival and reproduction of the organisms that are genetically best adapted to their environment.
Class Updates
• We only have 5 more classes until finals!
• Remember that finals are CUMULATIVE
• Journal and refresher questions might be on the test
Evidence for Evolution
Gray Wolf DNA
Sequence
ATT AAG CCG ATA
Shar-Pei DNA Sequence AAT GAA CCG ATA
Akita DNA Sequence ATT AAG CGG ATA
Husky DNA Sequence ATT GAA CGA ATA
Dingo DNA Sequence TTT GAA CGG AAA
Fossil Evidence
• The fossil record provides snapshots of the past thatillustrate evolutionary change over the past four billion years.
• There are some gaps in the fossil record
• Fossil evidence clearly shows that life is old and has changed over time
Comparative Anatomy
•Key Concept:
Comparing the
anatomy of different
organisms provides
clues about evolution
Homologous Structures
• Some organisms that
share a common
ancestor have features
that have different
functions, but similar
structures.
Homologous Structures
Analogous Structures
The wings of birds
and the wings of
dragonflies are
examples of
analogous structures.
An organ or structure that
likely once had a function in
an early ancestor• Examples
Vestigial Structures
Embryology
•Organisms develop similarly based
on shared ancestry
•During some stages of
development, organisms exhibit
ancestral features in whole or
incomplete form.
Embryology• What are some differences
between a:
• Fish
• Salamander
• Tortoise
• Chicken
• Pig
• Sheep
• Human
Embryology
Who is who?
A
B
C
D
E
F G
• Fish
• Salamander
• Tortoise
• Chicken
• Pig
• Sheep
• Human
Molecular Evidence
DNA Overview: http://statedclearly.com/videos/what-is-dna/
DNA Amino Acids Proteins
Molecular Evidence
•DNA Sequence Analysis
•Related species inherited the same
genes from a common ancestor
Gray Wolf DNA Sequence ATT AAG CCG ATA
Shar-Pei DNA Sequence AAT GAA CCG ATA
Akita DNA Sequence ATT AAG CGG ATA
Husky DNA Sequence ATT GAA CGA ATA
Dingo DNA Sequence TTT GAA CGG AAA
Overview and Review
• Stated Clearly: http://statedclearly.com/videos/what-is-the-evidence-for-
evolution/
• Evolution of Feathers: https://www.youtube.com/watch?v=hPLgfGX1I5Y