Concept explainers
New World monkeys _____.
- a. lack a tail
- b. are bipedal
- c. live only in Africa
- d. are dry-nosed primates
- e. are human ancestors
- f. all of the above
Concept introduction: The most advanced placental mammals are the primates. The primates are the only group of mammals that can extensively use their forelimbs for purposes other than locomotion. The primates have two suborders: Strepsirrhini and Haplorhini.
Answer to Problem 1SQ
Correct answer: New World monkeys are dry-nosed primates. Hence, the correct answer is option d.
Explanation of Solution
Reason for the correct answer:
During the early divergence of primates, they had two distinct lineages that include the wet-nosed primates (Strepsirrhini ) and the dry-nosed primates (Haplorhini). The dry-nosed primates include modern primates such as humans and monkeys. Refer Fig.26.2 “Proposed evolutionary tree for modern primates”, in the text. The lineage tree clearly shows that New World monkeys are Anthropoids that are diverged as dry-nosed primate from an early primitive ancestor.
Option d. is given as “are dry-nosed primates”. Since dry-nosed primates also include New World monkeys, the correct answer is option d.
Reason for the incorrect answers:
Option a. is given as “lack a tail”. New World monkeys do have a tail. Hence, option a. is incorrect.
Option b. is given as “are bipedal”. New World monkeys are not bipedal. Only humans are the primates that are bipedal. Hence, option b. is incorrect.
Option c. is given as “live only in Africa”. New World monkeys inhabit South America. Hence, option c. is incorrect.
Option e. is given as “are human ancestors”. The ancestors to humans are apes. Hence, option e. is incorrect.
Option f. is given as “all of the above”. New World monkeys are dry-nosed primates and none of the other options describes them. Therefore, the option cannot be 'all of the above'. Hence, option f. is incorrect.
Hence, options a., b., c., e., and f. are incorrect.
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Chapter 26 Solutions
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