Evolution Question 65
65. Which of the following is most important for speciation?
[2002]
(a) Seasonal isolation
(b) Reproductive isolation
(c) Behavioural isolation
(d) Tropical isolation
Show Answer
Answer : b
Hints & Solution
(b) Seasonal isolation refers to the differences in season of breeding that can isolate two varieties. Behavioural or ethological isolation refers to differences in behaviour like courtship rituals etc. to prevent mating. Mechanical isolation refers to the differences in the position, size and structure of animal genitalia which prevent reproductive contact and thus bring about isolation. Reproductive isolation is the prevention of interbreeds between the population of two different species.
