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Theories and Theorists

Across
Separation of a species or population so that they no longer interbreed and evolve into two separate species.
a fundamental principle of population genetics: population gene frequencies and genotype frequencies remain constant from generation to generation if mating is random and if mutation, selection, immigration, and emigration do not occur.
The creation of new species
the branch of biology that deals with the geographical distribution of plants and animals
Random change in allele frequencies.
The process of change over time
A common group of genes that consists of all genes including all the different alleles for each gene that are present in a population.
For of reproductive isolation in which two populations develop differences in courtship rituals or other behaviors.
Down
That one guy that studied the finches
When two populations are separated by geographic barriers. (i.e. rivers, mountains, bodies of water, etc.)
Proposed theory that organisms pass on traits they acquire in their lifetime.
Concluded Earth is very old and the processes that changed Earth in the past are the same processes that change Earth now.
the process whereby organisms better adapted to their environment tend to survive and produce more offspring.
A population or group of populations whose members can interbreed and produce fertile offspring
the branch of biology and medicine concerned with the study of embryos and their development
When two or more species reproduce at different times.
Reasoned if population grew unchecked, there wouldn't be enough living space and food for everyone.