Homologous and Analogous
What are homologous structures?
Body parts of organisms that are similar in structure and position, but different in function.
What is a vestigial structure?
Body parts that have lost their original function through evolution.
Which organisms are closer relatives: a whale and shark or a whale and a hippo?
whale and hippo
What is embryology?
The science of the development of embryos from fertilization to birth.
Naturally preserved remains, imprints or traces of organisms that lived long ago are called what?
What is an Analogous structure?
Body parts of organisms that perform a similar function but differ in structure.
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.
The same word fit's for both fill in the blank: All organisms on earth have ______. All ______ are made of DNA.
What is an embryo?
An unborn or unhatched offspring in the process of development.
The fossil record is enormous, but is still_________. (Complete or Incomplete)
incomplete
The wings of a butterfly and the wings of an eagle are an example of:
What purpose did our appendix use to serve?
Describe comparative anatomy as a science...
What is the STUDY of similarities and differences of living things and of fossils.
All humans have tails as embryos (now is vestigial). What do these tails develop into before we are born?
Our tailbone
Generally, the older the fossil, the shallower or deeper it is in Earth
The leg of a cat and the wing of a bird are an example of:
What are examples of vestigial structures in humans?
All humans have gills as embryos. What do these gills develop into before we are born?
a gland in our jaw that regulates calcium
What is a timeline of Earth's history that is broken up into chunks of time?
The Geologic Time Scale
Do homologous or analogous structures give us more evidence about two species sharing a common ancestor?
homologous
What is one vestigial structure in a whale?
pelvic bone
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.
What is made up of all the fossils ever discovered on Earth?