Class 10 Science Biology Heredity and Evolution



Homologous organs indicate
(a)
Convergent evolution
(b)
Common ancestory
(c)
Divergent evolution
(d)
Both B and C
Correct answer: (d) 
Solution: Homologous organs are similar in their morphology, anatomy, genetics and embryology but dissimilar in their function. Divergent evolution is the accumulation of differences between groups, which can lead to the formation of new species, usually a result of diffusion of the same species to different and isolated environments, which blocks the gene flow among the distinct populations allowing differentiated fixation of characteristics through genetic drift and natural selection. Primarily diffusion is the basis of molecular division can be seen in some higher-level characters of structure and function that are readily observable in organisms. So, homologous organs also indicate the divergent evolution. Thus, option D is correct. Analogous organs indicate convergent evolution. Thus, option A is wrong.

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