Study TipsMay 19, 20266 min read
MDCAT Evolution & Variety of Life 2026 — Natural Selection, Speciation, Kingdoms
Premeth Team
Meth Experts
Evolution + Variety of Life yield 3–5 of the 81 MDCAT Biology MCQs. Master Darwin's natural selection, the four main evidences for evolution, and the 5-kingdom Whittaker classification.
- Estimated MCQs — 3–5 of 81 Biology
- Whittaker's 5 kingdoms — Monera, Protista, Fungi, Plantae, Animalia
- Lower-yield but tested — Hardy-Weinberg, allopatric vs sympatric speciation
Source: PMDC MDCAT 2026 syllabus.
Natural Selection (Darwin)
- Variation exists within populations.
- Overproduction — more offspring than environment supports.
- Struggle for existence — competition for resources.
- Survival of the fittest — advantageous variations are inherited.
Evidence for Evolution
- Fossil record — transitional forms (Archaeopteryx, Tiktaalik).
- Comparative anatomy — homologous (same origin, different function: human arm / whale flipper) vs analogous (different origin, same function: bird wing / insect wing) structures.
- Vestigial organs — e.g., human appendix, coccyx.
- Embryology — similar early embryonic stages across vertebrates.
- Molecular evidence — DNA / protein similarities across species.
5-Kingdom Classification (Whittaker)
| Kingdom | Cell type | Examples |
|---|---|---|
| Monera | Prokaryotic | Bacteria, cyanobacteria |
| Protista | Eukaryotic, unicellular | Amoeba, Paramecium, algae |
| Fungi | Eukaryotic, multicellular (most) | Mushrooms, yeasts, moulds |
| Plantae | Eukaryotic, autotrophic | Plants |
| Animalia | Eukaryotic, heterotrophic | Animals |
FAQ
Q: Homologous vs analogous — the difference?
Homologous = same evolutionary origin, may have different function. Analogous = different origin, similar function (convergent evolution).
Q: Speciation types?
Allopatric (geographical separation), sympatric (no geographic barrier), parapatric (partial barrier).
Pair with Genetics — evolution and genetics interconnect. Drill Biology past papers.
Related Tags
#MDCAT#Biology#Evolution#Classification
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