Q45.Match List I with List II
List I
A. Allopatric Species
B. Sympatric Species
C. Sibling Species
D. Parapatric Species
List II
I. Species inhabiting the same geographical area
II. Species inhabiting different geographical areas
III. Species occupying separate areas that share a common boundary
IV. Species which are morphologically identical but reproductively isolated
Choose the correct answer from the options given below :
(1) A-II, B-I, C-IV, D-III
(2) A-I, B-II, C-III, D-IV
(3) A-I, B-III, C-IV, D-II
(4) A-II, B-IV, C-I, D-III
Correct Answer: (1) A-II, B-I, C-IV, D-III
Speciation modes define how new species arise based on geographic separation and reproductive isolation patterns.
Definitions
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Allopatric Species (A): Species in different geographical areas (II), separated by physical barriers like mountains or rivers preventing gene flow.
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Sympatric Species (B): Species in the same geographical area (I), diverging through reproductive isolation despite overlapping ranges.
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Sibling Species (C): Morphologically identical but reproductively isolated (IV) species that look alike but cannot interbreed.
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Parapatric Species (D): Species in separate areas sharing a common boundary (III), with limited gene flow at contact zones.
Option Analysis
Unlock allopatric sympatric sibling parapatric species matching for evolution exams. Correct option (1) perfectly aligns different geographical areas (II), same area (I), morphologically identical/reproductively isolated (IV), and shared boundary regions (III).
Speciation Types Decoded
Allopatric: Physical barriers create different geographical areas (II)—Darwin’s finches across Galápagos islands.
Sympatric: Reproductive isolation in same geographical area (I)—polyploid plants or host-specific insects.
Sibling: Morphologically identical but reproductively isolated (IV)—Anopheles mosquito complexes.
Parapatric: Adjacent populations with shared boundary (III)—shoreline snail morphs with edge hybridization.
Why Option 1 is Textbook Perfect
Each term maps precisely to geographic/reproductive isolation definitions: allopatric = separated, sympatric = overlapping, sibling = cryptic, parapatric = adjacent. Other options confuse spatial patterns with morphological similarity.
Exam Memory Framework
“A-Separate (II), S-Same (I), Sib-Similar (IV), P-Parallel (III)”. Visualize: allopatric (island vs mainland), sympatric (two flies on same apple), sibling (identical twins can’t breed), parapatric (two colors meeting at habitat edge).
