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7A Evidence of Common Ancestry

fossil record, homologies, biogeography 7a, 7b
by

Gabriella Williams

on 19 March 2015

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Transcript of 7A Evidence of Common Ancestry

TEKS 7A Evidence of Common Ancestry
These indicate that similar body structures evolved due to close ancestry
This is a body structure of an organism that no longer serves its original purpose but was probably useful to an ancestor.
Summarize the 3 things you would look for to determine if two organisms
had a common ancestor. Give one example for each item.
What is COMMON ANCESTRY?
How does the FOSSIL RECORD provide evidence of common ancestry?
How does BIOGEOGRAPHY provide evidence of common ancestry?
How do HOMOLOGIES provide evidence of common ancestry?
The concept that a group of closely related species all descended with some modifications from the same ancestor.
Adaptations can lead to SUCCESS!!
Jawless Fish EVOLVE.....
JAWS!!!
How do you know???
EVIDENCE
Fossils
Homologies
Biogeography
provide evidence about the order in which FEATURES evolved over time
allows scientists (YOU) to hypothesize how groups are related to one another
Who's ancestor is this?
tells us how close relatives differentiated under DIFFERENT SELECTION pressures (geographical isolation)
how distant relatives have evolved similar traits under SIMILAR SELECTION pressures
So what if...
preserve remains of ancient organisms
the study of where species live now and where species and their ancestors lived in the past
species with common ancestor that share similar characteristics
Anatomical Homologies
Molecular Homologies
Developmental Homologies
Similarities in EMBRYONIC development....think about your TAIL BONE!!
Similarities on molecular level...DNA sequence
Similarities in structures like limbs or organs
Homologous Structures
Vestigial Structures
Can you answer your 4 questions CONFIDENTLY??
YES...THEN YOU SHOULD REVIEW BUT YOU ARE IN GOOD SHAPE :)
NO...YOU NEED TO MAKE NOTECARDS, READ YOUR NOTES, AND/OR COME TO TUTORING!!!
SOMETHING TO THINK ABOUT...
became so different
Full transcript