Question

Consider the following terms/phrases:

1. Change in chromosome number

2. Geographical isolation

3. Competition for food

4. Reproductive isolation

Which of these factors are responsible for speciation?

• A. 2 and 3 only
• B. 1, 2, 3 and 4
• C. 1 and 4 only
• D. 3 and 4 only

Answer 1

The correct option is B 1, 2, 3 and 4

Speciation is the process of formation of new species. Change in chromosomal numbers will result in reproductive isolation. Geographical isolation and reproductive isolation stops the organisms from interbreeding. This might lead to speciation.
Competition for food leads to competition for habitat. This results in change in habitat for some individuals of the species eventually leading to speciation.