The maximum likelihood tree constructed for the mammals in the figures above supports which of the competing hypotheses for the evolutionary relationships among mammalian groups?
A)The Marsupionta hypothesis
B)The Theria hypothesis
C)Neither theory
D)Both theories

Question

The maximum likelihood tree constructed for the mammals in the figures above supports which of the competing hypotheses for the evolutionary relationships among mammalian groups?
A)The Marsupionta hypothesis 
B)The Theria hypothesis 
C)Neither theory 
D)Both theories

Quizplus · Accepted Answer

The maximum likelihood tree constructed for mammals supports the Theria hypothesis, as the marsupials and placentals appear as sister groups within the Theria clade. This is supported by the analysis of molecular sequence data, morphological traits, and fossil evidence. The Marsupionta hypothesis, which proposes a closer relationship between marsupials and monotremes, is not supported by the tree.

The Maximum Likelihood Tree Constructed for the Mammals in the Figures