When Did Monocotyledon Evolve?
Molecular Clock Studies (Which Employ Differences in Dna to Estimate When a Group Split from Its Ancestors) Suggest That Monocots May Have Originated as Early...
Molecular clock studies (which employ differences in DNA to estimate when a group split from its ancestors) suggest that monocots may have originated as early as 140 million years ago.
Did monocots evolve first?
Monocots: Systematics
The group appears early in the fossil record of angiosperms, and seems to have radiated into most of its major clades before the end of the Cretaceous. The monocots diverged form their dicot relatives very early in the evolution of flowering plants.
When did monocots and dicots diverge?
Both methods lead to an estimate of the monocot-dicot divergence at 200 million years (Myr) ago (with an uncertainty of about 40 Myr). This estimate is also supported by analyses of the nuclear genes encoding large and small subunit ribosomal RNAs.
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