How is a fossil formed

The change in the frequency of an existing gene variant in a population due to random sampling of organisms.

The age of humans

The process of biological change by which descendants come to differ from their ancestors

When a insect, plant, etc. was encased in ancient tree sap

The transfer of genetic variation from one population to another.

The age of dinosaurs

The process by which human changes a species by breeding it for certain traits

A fossil of just a trace of an animal , which could be a footprint, nests, etc.

Different forms of a gene

Massive extinctions occurred during this time

The measure of ability to survive and produce more offspring relative to other members of a population

This fossil is created by mineral deposits form internal casts of organisms. Carried by water, these minerals fill the spaces within organic tissue.

The main producer of new alleles in populations

When the continents started drifting

The genetic variation stored in population

What do fossils tell about the past?

What describes and predicts a balanced equilibrium in the frequencies of alleles and genotypes within a freely interbreeding population

The Radiation of Mammalia

The observable change in allele frequency of a population over time