Convergent Evolution: Marsupial and Placental Mammals
Biology · Evolution · NEET
Australian marsupials and placental mammals live in different regions but evolved into similar body forms to do the same jobs. Because two unrelated groups independently developed similar features, NCERT calls this convergent evolution. Memory hook: "Same job, different family -> convergent." The classic pair is the Tasmanian wolf (marsupial) and the placental wolf.
Two unrelated mammal lines (marsupial and placental) evolve separately but converge on the same wolf-like body to do the same job. This is convergent evolution, giving analogous look-alikes such as the Tasmanian wolf and the placental wolf.
Your doubts, answered
Is the similarity between marsupials and placental mammals convergent or divergent evolution?
It is convergent evolution. The two groups are not closely related and evolved separately, yet they developed similar body shapes and habits. NCERT states that when unrelated lineages in different habitats acquire similar adaptive features, this is convergent evolution. Divergent evolution is the opposite: one common ancestor giving rise to different forms.
Why do Australian marsupials look so much like placental mammals?
Both groups faced similar environments and needed to do similar jobs, such as hunting, digging, or gliding. Natural selection favoured similar body designs for the same function, so a placental wolf and the Tasmanian wolf (a marsupial) look alike even though they belong to separate mammal groups.
What is the exact example NCERT gives for convergent evolution in mammals?
NCERT gives the Placental wolf and the Tasmanian wolf (a marsupial). Both are wolf-like hunters, but one is a placental mammal and the other is a marsupial. Their similar look is due to convergent evolution, not shared ancestry.
How is adaptive radiation different from convergent evolution here?
Adaptive radiation happens within each group: marsupials radiated into many forms inside Australia, and placental mammals radiated into many forms elsewhere. Convergent evolution is the match-up between the two separate radiations, where a marsupial form looks like a placental form doing the same job. So each group shows adaptive radiation, but the similarity between the groups is convergent evolution.
Are marsupial and placental look-alikes analogous or homologous?
They are analogous. Analogous structures perform the same function and look alike but come from different ancestral lines, and analogy is the result of convergent evolution. Homologous structures share a common ancestor and result from divergent evolution.
⚠️ The NEET trap ✗ Marking the marsupial and placental mammal similarity as adaptive radiation or divergent evolution. ✓ The similarity between the two separate groups is convergent evolution. Adaptive radiation describes the spread within each group, not the match between them. 🧠 Within one group spreading out = adaptive radiation. Two different groups meeting at the same design = convergent evolution.
Real NEET questions
NEET 2019 Odisha
In Australia, marsupials and placental mammals have evolved to share many similar characteristics. This type of evolution may be referred to as
A · Adaptive Radiation
B · Divergent Evolution
C · Cyclical Evolution
D · Convergent Evolution ✓
Solution: When two unrelated groups (marsupials and placental mammals) independently evolve similar features for the same function, NCERT calls it convergent evolution. Example: placental wolf and Tasmanian wolf-marsupial. Each group also shows adaptive radiation, but the shared look between the two groups is specifically convergent evolution.
ReNEET 2026
Adaptive radiation in placental mammals and Australian marsupials, leading to similarity between distant species, is an example of ________.
A · divergent evolution
B · convergent evolution ✓
C · founder effect
D · genetic drift
Solution: Marsupials and placental mammals radiated independently, yet produced strikingly similar forms such as the marsupial wolf and the placental wolf. Two unrelated lineages evolving similar features is convergent evolution. Founder effect and genetic drift are chance changes in allele frequency, not this pattern.
Solved Evolution NEET PYQs
Try the real previous-year questions from this chapter — each with the answer and a full solution.
It is when two groups that are not closely related evolve similar features because they live in similar conditions and do similar jobs. The similarity comes from the same function, not from a shared ancestor.
Give the main NCERT example of convergent evolution in mammals.
The placental wolf and the Tasmanian wolf. One is a placental mammal and the other is a marsupial, but both are wolf-like hunters that look alike due to convergent evolution.
Do marsupials and placental mammals share a recent common ancestor?
No. They belong to separate mammal groups and evolved on their own. Their look-alike forms are analogous features produced by convergent evolution, not signs of close ancestry.
Is this topic important for NEET?
Yes. NEET repeatedly asks whether the marsupial and placental similarity is convergent, divergent, or adaptive radiation. The correct answer is convergent evolution, and the safe example to write is placental wolf and Tasmanian wolf.
