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 ------ - - ----- - --
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Transcribed Image Text:The tree below shows a proposed phylogeny of the three broadest mammal groups.
monotremes
marsupials
eutherians
Figure 1: Phylogenetic relationsbips between defrent ypes
of 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
e. Which of the above characters are shared ancestral characters of eutherians? List all that
apply.
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