7 The tree below shows a proposed phylogeny of the three broadest mammal groups. monotremes marsupials eutherians Figure 1: Płylegenenic relationsbips between diferent ppes ef mammals. a. Which group of mammals branched off the earliest? b. Which letter designates the common ancestor to monotremes and marsupials? c. Indicate where on the tree (short perpendicular line) each of the following characters arose. 1. long-lived placenta 4. internal gestation (rather than in egg) 2. body hair 5. long-term gestation 3. production of milk for young 6. live birth (rather than egg laying ------ - - ----- - --

7 The tree below shows a proposed phylogeny of the three broadest mammal groups. monotremes marsupials eutherians Figure 1: Płylegenenic relationsbips between diferent ppes ef mammals. a. Which group of mammals branched off the earliest? b. Which letter designates the common ancestor to monotremes and marsupials? c. Indicate where on the tree (short perpendicular line) each of the following characters arose. 1. long-lived placenta 4. internal gestation (rather than in egg) 2. body hair 5. long-term gestation 3. production of milk for young 6. live birth (rather than egg laying ------ - - ----- - --

Biology Today and Tomorrow without Physiology (MindTap Course List)

5th Edition

ISBN:9781305117396

Author:Cecie Starr, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Christine Evers, Lisa Starr

Chapter11: Evidence Of Evolution

Section: Chapter Questions

Problem 1CT

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800 Proterozoic 700 600 541 Phanerozoic 485 Demospongiae Hemichordata Echinodermata Vertebrata Nemertea Brachiopoda Mollusca Annelida Bryozoa Priapulida Onychophora Arthropoda Cnidaria