Reptiles Avians Monotremes Marsupials Cattle Mice Human 80MYA 105 MYA 180 MYA 21

Question

Reptiles Avians Monotremes Marsupials Cattle Mice Human 80MYA 105 MYA 180 MYA 210 MYA 310 MYA The tree above shows the phylogenetic relationships among reptiles, avians (birds), monotremes, marsupials, and placental mammals (cattle, mice, and humans are shown as examples). Which of the following statements is INCORRECT, based on this tree? Select one: a. Marsupials are more closely related to monotremes than they are to placental mammals. b. Marsupials are more closely related to one another than they are to other mammals (monotremes and placental mammals). c. All placental mammals share a common ancestor O d. Monotremes are more closely related to other mammals (marsupials and placental mammals) than they are to reptiles and birds. O

Explanation / Answer

Answer: option A is correct.
From the given cladogram, it can be clearly observed that all the mammals share a common ancestor. So, option C is correct.
Monotremes and other mammals originated from a common ancestor. Hence monotremes are more closely related to other mammals than to reptiles or birds. Hence option D is correct.

Marsupials are more closely related placental mammals than to monotremes.

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