:: Geographic isolation doesn't necessarily mean reproductive isolation.
22.
Reproductive isolation can be caused by allopatric speciation.
23.
Many geneticists who work on speciation prefer the BSC because it emphasizes the role of reproductive isolation.
24.
:: : : Animal species which show problems producing fertile offspring actually already have achieved reproductive isolation.
25.
While the timberline sparrow recognizably differs in some details, there is little reproductive isolation between the taxa.
26.
Mayr emphasized the importance of allopatric speciation, where geographically isolated sub-populations diverge so far that reproductive isolation occurs.
27.
Triploid blocks lead to reproductive isolation.
28.
It is evident that selection against the hybrids was very effective in increasing reproductive isolation between these species.
29.
Mating tests are common in some groups such as fungi to confirm the reproductive isolation of two species.
30.
Health of the offspring varies even within populations and is really not a very good indicator of reproductive isolation.
