Phylogenies The process of evolution produces a pattern of relationships between species As lineages evolve and split and modifications are inherited their evolutionary paths diverge This ID: 332299
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Slide1
PhylogenySlide2
Phylogenies
The process of evolution produces a pattern of relationships between species.
As
lineages evolve and split and modifications are inherited, their evolutionary paths diverge.
This
produces a branching pattern of evolutionary relationships.
By
studying inherited species’ characteristics, we can reconstruct evolutionary relationships and represent them on a “family tree,” called a phylogeny. Slide3
Phylogenies
Understanding a phylogeny is a lot like reading a family tree. The root of the tree represents the ancestral lineage, and the tips of the branches represent the descendents of that ancestor. As you move from the root to the tips, you are moving forward in time.
Shows the same thing…Just shown in two different ways!!Slide4
Phylogenies
When a lineage splits (speciation), it is represented as branching on a phylogeny. When a speciation event occurs, a single ancestral lineage gives rise to two or more daughter lineages.
Slide5
Phylogenies
Phylogenies trace patterns of shared ancestry between lineages. Each lineage has a part of its history that is unique to it alone and parts that are shared with other lineages.Slide6
Phylogenies
Similarly, each lineage has ancestors that are unique to that lineage and ancestors that are shared with other lineages—common ancestorsSlide7Slide8Slide9
PhylogenySlide10
Evolutionary Relationships
Phylogenetic
trees may show shared derived traitsSlide11
Another Example of TraitsSlide12
Other Means of Showing Evolutionary Relationships
Chromosome Comparison – Number and types of chromosomes
Biochemistry – Similar amino acid sequences between groups of organisms shows relatednessSlide13
Differences in Amino Acid Sequences
Chimp anzee V K A H G K K V L G A F S D G L A H L D
Gorilla V K A H G K K V L G A F S D G L A H L D
Baboon V K A H G K K V L G A F S D G L
N
H L DLemur V K A H G K K V L
T A F S E G L
H
H L D
Dog V K A H G K K V L
N
S
F S D G L
K
N
L D
Chicken V
R
A H G K K V L
T
S
F
G
D
A
V
K
N
L D
Frog V
L
A H G E K V L
A
A
I
G
E
G L
K
H
P
E