Biological Evidence of Evolution (Evidence for Evolution (Molecular…
Biological Evidence of Evolution
How are Earth's organisms related?
They came from the same ancestor and changed trough evolution.
What evidence from living species supports the theory that species descend from other species over time?
The comparative anatomy, vestigial structures, development biology and molecular biology.
The Study of Evolution Today
Evolution have produced Earth's wide diversity of organisms.
Scientists have different ideas about the rate in which natural selection produces new species.
Evidence for Evolution
In a molecular clock we can see in what time period species diverged from common ancestors.
Scientists study organisms relationships by looking at genes and proteins.
All organisms have genes and all genes are made of DNA, this supports the idea that all organisms are related.
Molecular biology is the study of gene structure and function.
Pharyngeal pouches is a trait that develops in different stages in all vertebrate organisms.
Embryos of different species often resemble each other at different stages of their development.
An organism that have a vestigial structure suggests that the species is related to an ancestor that used this structure.
Analogous structures suggest that species are not closely related.
The more similar structures are, the more likely that the species had evolved from a recent common ancestor.
Homologous structures suggest that species are related.
In many species common ancestry is not difficult to see.
The degree of relation between species depends on how closely in time they diverged.
Living species that are closely related share a close common ancestor.
The science of the development of embryos from fertilization to birth.
Body part that has lost its original function trough evolution.
Body parts that perform a similar function but differ in structure.
Body parts of organisms that are similar in structure and position but different in function.
The study of similarities and differences among structures of living species.