Homologous and Analogous
Vestigial Structures
Molecular Biology
Embryology
Fossil Record
100
What are homologous structures?
Body parts of organisms that are similar in structure and position, but different in function.
100
What is a vestigial structure?
Body parts that have lost their original function through evolution.
100
Which organisms are closer relatives: a dolphin and shark or a human and a dolphin?
human and dolphin
100
What is embryology?
The science of the development of embryos from fertilization to birth.
100
Naturally preserved remains, imprints or traces of organisms that lived long ago are called what?
fossils
200
What is an Analogous structure?
Body parts of organisms that perform a similar function but differ in structure.
200
How are vestigial structures evidence of descent from ancestral species?
A structure with no function in a living species suggests that it descended from an ancestor that used the structure.
200
The same word fit's for both fill in the blank: All organisms on earth have ______. All ______ are made of DNA.
genes
200
What is an embryo?
An unborn or unhatched offspring in the process of development.
200
The fossil record is enormous, but is still_________.
incomplete
300
The wings of a butterfly and the wings of an eagle are an example of:
Analogous Structures
300
What purpose did our appendix use to serve?
Help digest food
300
Which organism is most closely related to organism A from this gel electrophoresis picture?
Species Z
300
All humans have tails as embryos. What do these tails develop into before we are born?
Our tailbone
300
Generally, the older the fossil, the shallower or deeper it is in Earth
deeper
400
The leg of a cat and the wing of a bird are an example of:
Homologous Structures
400
What are two examples of vestigial structures in humans?
Appendix, tailbone, wisdom teeth, body hair, etc
400
Molecular biology looks at how similar or different _____ is in different animals.
DNA/Proteins
400
All humans have gills as embryos. What do these gills develop into before we are born?
Our jaw line
400
What provides evidence that species have changed over time?
Fossil Record
500
Do homologous or analogous structures give us more evidence about two species sharing a common ancestor?
homologous
500
What is one vestigial structure in a whale?
thumb
500
How is molecular biology used to determine relationships among species?
By comparing shared genes or proteins in different species to see how closely they match. The closer the match, the more likely they're related.
500
How can embryos be used as evidence of a common ancestor between organisms?
Evidence of common anatomy in embryos suggests that they inherited the genes for that anatomy from a common ancestor
500
What is made up of all the fossils ever discovered on Earth?
Fossil record