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Question
Which one of the following statement is correct?
Options
there is no evidence of the existence of gills during embryogenesis of mammals.
all plant and animal cells are totipotent
ontogeny repeats phylogeny
stem cells are specialised cells
MCQ
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Solution
Ontogeny repeats phylogeny
Explanation:
The recapitulation theory, associated with Haeckel, states that ontogeny recapitulates phylogeny. The other choices are incorrect: vertebrate embryos show pharyngeal structures, not all cells are totipotent, and stem cells are unspecialised.
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