Step 1: Sympatric speciation is the evolution of new species from an ancestral species occupying the same geographic area. There is no physical separation of populations, distinguishing it from allopatric speciation.
Step 2: Sympatric speciation mechanisms include: Behavioral isolation, Ecological isolation (e.g., differing habitat preferences within a region), Polyploidy in plants, and Genetic divergence without geographic barriers.
Step 3: Incorrect options discarded: (A) Geographic isolation characterizes allopatric speciation. (C) Migration to a new habitat signifies geographic separation, contrary to sympatric speciation. (D) Gradual accumulation of changes is a general speciation component, not specific to sympatric speciation.
How many of the following genotypes possibly represent normal wings in Drosophila?
(i) \( Vg^+Vg^+ \)
(ii) \( Vg^+Vg^{ni} \)
(iii) \( Vg^+Vg^{no} \)
(iv) \( Vg^+Vg^{st} \)
(v) \( Vg^+Vg \)