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The Evidence for Evolution
Nothing in biology makes sense exceptin the light of evolution.
-- Theodosius Dobzhansky
Key QuestionWhat evidence supports the theory of
evolution?
Key Points1.Homologous structures are
one type of evidence for the evolution of living things.
2.Early stages, or embryos, of many animals with back bones are very similar.
Major Vocab•Homologous Structures - Structures
that have different forms but develop from the same embryonic tissue.
•Vestigial Organs - Organ that serves no useful function in an organism.
•Embryo - organism in its early stages of development.
Homologous Body Structure1. Scientists have noticed that animals’ body part structure have striking
similarities.
2. Homologous structures provide strong evidence that all 4-limbed vertebrates
have descended, with modifications, from common ancestors.
What are some examples of 4-limbed vertebrates?
What similarities do you see between these 4 animal parts?
Example 1-Animal Limbs
Even though these structures serve very different functions, their origin is from the same
embryonic tissue.
Similarities in Embryology
1.Many embryos look especially similar during early stages of development.
2.The same group of embryonic cells develop in similar patterns.
FROG DISSECTION!!!
•You do not have to touch, but you do have to participate.
•No unnecessary cuts.
• If you have a question, ask!
•Respect the animal that we are learning from.
•Have fun!!!