Question

Reproductive isolation in sympatric speciation develops without a

• A. Geographic barrier
• B. Barrier to gene flow
• C. Change in chromosome number
• D. Barrier to mating

Answer 1

Answer: (A)

Geographic barrier

• Speciation occurs due to reproductive isolation. This can be caused by mating differences, sterility or environmental barriers that eventually lead to the adaptive splitting into two species.
• Reproductive isolation is the inability of a species to breed successfully with related species due to geographical, behavioural, physiological or genetic barriers.
• Sympatric speciation refers to the formation of two or more descent species from a single ancestral species all occupying the same geographic location. It also results from the sexual conflict.

So, the correct answer is option A.