Homologous Structures
What is a homologous structure?
Similar physical features in organisms that share a common ancestor, but the features serve completely different functions.
What is an analogous structure?
something with the same function as another species' but not the same structure or species.
What is a vestigial structure?
A structure that was once used in early organisms, but has become useless or dormant in the body.
This structure found in different animals, such as the fins of fish and the wings of bats, are used for swimming and flying respectively
Analogous Structures
What letter does Mrs. Hutchins' middle name start with?
M (Marie)
What are two types of evidence scientists use to provide evidence of evolution?
fossils, dna, anatomical, embryological
What is the difference between analogous structures and homologous structures?
Analogous = Same function, different structure
Homologous = different function, same structure
What is the vestigial structure that makes cave fish different from minnows?
vestigial eyes that don't work / are barely even there
This type of structure is found in different animals, such as the camouflage of chameleons and octopuses, are used for blending in with the environment but have evolved independently.
Analogous Structures
How many lanes are on our track?
six
These homologous structures found in the arms of a human and the arms of a cat have a similar structure and ancestry but may have different functions.
Bones
A butterfly wing is analogous to________?
answers vary
This vestigial structure found in some animals that breaks down tough food like bamboo has no known function and is thought to be a remnant of a structure that was once useful.
The appendix?
In what way analogous structures are different from vestigial structures?
Analogous structures have a current function while vestigial structures have lost or reduced function through evolution
How many pets does Mrs. Hutchins have?
1
Give an example of a homologous structure found in two animals.
Answers will vary
Give an example of an analogous structure found in two different animals.
Answers will vary!
What is one example of a vestigial structure found in humans?
Ear muscles, wisdom teeth, tonsils, appendix, tail bone...
How do analogous structures support the theory of evolution?
They demonstrate similar solutions to similar problems and they can evolve independently through convergent evolution.
In which three states has Mrs. Hutchins has lived? (one of them is where she went to college)
CA, MA, VT
What is an example of a homologous structure in whales?
fins
These analogous structures in both birds and bats have a similar structure and function but have evolved independently.
wings
What is an example of a vestigial structure in humans?
varying answers
How can scientists determine whether two structures are analogous or homologous?
Scientists can use comparative anatomy, molecular biology, and the fossil record to determine whether two structures are analogous or homologous.
What is the name of Mrs. Hutchins' dog?
Poquito