Question

geographical and reproductive isolation of organisms gradually leads to speciation

Answer 1

A single population (a) is fragmented by a barrier (b); geographical isolation leads to genetic divergence (c); when the barrier is removed, the two populations come back into contact with each other, and there is selection for increased reproductive isolation (d); if reproductive isolation is effective

Answer 2

Answer:

• Evolution  leads to  the  formation  of  new  species  from as speciation.
• An  existing  one  is known Species  is the  group  of  organisms that  can  reproduce  among  themselves and  produce  fertile  offspring.
• The  origin  of  many  species  is due  to  the  separation  of some  individuals of  one  species by  geographic barrier.
• It  prevents  the  reproduction  in separated  groups.  
• The  separated  groups can  follow  its  own  evolutionary  course  and evolved  into  two  species.