as in parapatric speciation. At least five cases of speciation genes have been confirmed so far. Most bear a strong signature of positive selection. Three of the five known speciation genes are ...

of the difference between the full unconstrained six-parameter model and a five-parameter model with the speciation or transition rates constrained to be equal.

Hybrid speciation is quite rare in animals ... their collaborators sequenced and analyzed DNA from 425 individuals for five of the Pachyptila species, and for the closely-related blue petrel ...

Today, biologists are much more knowledgeable about this process, which they call “speciation.” Here’s what you need to know about speciation, and about the primary pathways of this process, known as ...

the researchers have discovered at least eleven new instances of sympatric speciation and suggest that as many as one in five species on the island may be the products of this process. More ...

The biological equivalent is "allopatric speciation," an evolutionary process in which one species divides into two because the original homogenous population has become separated and both groups ...

A less common type of speciation, called "sympatric," occurs when a new species arises from a single population that has no geographic or physical barriers. A famous example is the Rhagoleitis ...

Butterfly Speciation Event Recreated Date: June 16, 2006 Source: Smithsonian Tropical Research Institute Summary: New evidence for homoploid hybrid speciation in animals is presented in the June ...

Save guides, add subjects and pick up where you left off with your BBC account. As long as the individuals in a population have the opportunity to interbreed and combine genes, they remain one ...