Which mode of speciation occurs in the geographic location?

• A. Allopatric speciation
• B. Parapatric speciation
• C. Ecological species concept
• D. Sympatric speciation

Answer: (D)

Sympatric speciation occurs when new species arise within the same geographic area, without any physical barrier separating the diverging groups. Reproductive isolation develops while the populations share the habitat, often through disruptive selection on different ecological niches or through mate-choice preferences; in plants, polyploidy can instantly create a reproductive barrier inside the same area. This matches the idea of speciation happening in the geographic location because there is no geographic separation driving the split. By contrast, allopatric speciation needs a geographic barrier that splits populations, parapatric involves adjacent populations with limited gene flow along a boundary, and the ecological species concept describes how we define species by their ecological role rather than the mode of origin. Examples include polyploid speciation in plants or insects that shift to different host plants and diverge behaviorally and reproductively while still in the same place.