Questions pertaining to the processes by which new species arise.
9
votes
3answers
608 views
Species with reproduction barriers that can both reproduce with a third species
To start with, I do not have a sound knowledge in biology or any formal education in the area.
I was told that one of the definition of a species is a reproductive barrier, which means that if two ...
2
votes
1answer
51 views
Speciation by polyploidy
Speciation can occur by polyploidy. My understanding of the process is as follows:
'polyploidy is when the number of chromosomes in an organism's cell doubles. This means that the organism has more ...
11
votes
2answers
221 views
Evolution in 37 years, is it possible?
I am confused, can evolution ( speciation ) really occur in such a short time ?
In 1971, biologists moved five adult pairs of Italian wall lizards from their home island of Pod Kopiste, in the ...
2
votes
1answer
70 views
Were there lifeforms before LUCA?
This question got me thinking about something. LUCA is the last universal common ancestor of all current living organisms, which is a very different definition from the first-ever living organism. Is ...
5
votes
1answer
91 views
Is extreme cladism a mainstream position in the species debate?
In the philosophy of biology it has been claimed many times that a popular position regarding the question of what species are, among biologists, is cladism. For my current purposes, the defining ...
