23) Which of the following statement regarding sympatric speciation is incorrect

Question

23) Which of the following statement regarding sympatric speciation is incorrect? Gene flow may be interrupted due to a river changing its course Gene flow may be interrupted due to autopolyploidy Gene flow may be interrupted due exploitation of a different habitat by subpopulations Gene flow may be interrupted due to allopolyploidy 4) DN A sequences in many human genes are very similar to the sequences of corresponding genes in chimpanzees. The most likely explanation for this result is that- humans and chimpanzees share a relatively recent common ancestor humans evolved from chimpanzees. chimpanzees evolved from humans. tconvergent evolution led to the DNA similarities. Which of these should decline in hybrid zones where reinforcement is occurring? a gene flow between distinct gene pools speciation mutation rate hybrid sterility Gthe genetic distinctness of two gene pools

Explanation / Answer

Sympatric speciation occurs when populations of species which share the same habitat become reproductively isolated. This is brought about by polyploidy. Polyploidy means duplicate copies of genome is present, when two sets of same genes is present it is called diploidy, similarly triploidy, tetraploidy and so on. This moat commonly occurs in plants, difficult in animals because Plants can selfreproduce giving rise to polyploidy.

The answer to question is a) gene flow interrupted by river changing its course. Physical seperation leads to Allopatric speciation, not sympatric speciation.

The answer to second question is a) humans and chimpanzee share a common ancesters.

Being evolved from single ancestor, the same DNA was passed on from generations to generations due to which our DNA is almost 96 to 98% similar to chimps.The difference of 2 to 4 % has brought about different appearance and behavior which differ between us.

The answer to third question is a) gene flow between distinct gene pools

Reinforcement is process by which hybrid zones develops into full species barrier. Therefore gene flow should not occur

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