BIOLOGY(LL)-W/ACCESS CODE >CUSTOM<
BIOLOGY(LL)-W/ACCESS CODE >CUSTOM<
12th Edition
ISBN: 9781264058167
Author: Raven
Publisher: MCG CUSTOM
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Chapter 28, Problem 1DA
Summary Introduction

To determine: The evolutionary significance of a choanoflagellate.

Introduction: Chloroplasts are the organelles that are necessary for photosynthesis. They are found exclusively in plant cells and some cells of algae. They contain the pigment chlorophyll that is used for driving the process as it contains various proteins that convert carbon dioxide into carbohydrate molecules.

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Pictorial representation: The figure represents the phylogenetic relationship between red, green, and brown algae.

BIOLOGY(LL)-W/ACCESS CODE >CUSTOM<, Chapter 28, Problem 1DA

Fig.1: The phylogenetic relationship between red, green and brown algae

The autotrophs are the organisms that can synthesize their food by the process of photosynthesis. They harvest the energy from sunlight and convert it into usable form carbohydrate cause glucose. The autotrophs include plants, some bacteria, and algae. The algae are of three types depending upon the pigment present in their chloroplast. These three groups are Phaeophyceae, Rhodophyceae, and Chlorophyceae. The green algae Chlorophyceae is known to give rise to land plants that are modern-day photosynthetic organisms.

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a. Phylogenetic relationships based on chloroplast genes Brown algae Diatoms Most photosynthetic dinoflagellates Cryptophyte algae Red algae Red algae Green algae Euglenids Green algae Chlorarachniophyte algae Green algae Green algae Green algae Green algae Land plants Glaucocystophytes Cyanobacteria b. Phylogenetic relationships based on nuclear genes Opisthokonts Amoebozoans Glaucocystophytes Red algae Green algae (including land plants) Cryptophyte algae 140000 Diatoms Brown algae Dinoflagellates Chlorarachniophyte algae Chloroplast genes relate brown algae, diatoms, most dinoflagellates, and cryptophyte algae to red algae, which is different from the relationships based on nuclear genes shown in part b. -Excavates Chloroplast genes relate euglenids and chlorarachniophyte algae to green algae, which is different from the relationships based on nuclear genes shown in part b. Chloroplasts form a monophyletic group nested within cyanobacteria, providing strong evidence for the…
Part B- Phylogenetic trees and geographic relationships The island fox, Urocyon littoralis, is endemic to the Channel Islands, which are located off the coast of southern California, Six of the eight Channel Islands support fox populations, and each of these islands is home to a distinct subspecies, as shown in the table below. Island Subspecies Santa Cruz santacruzae Northern Chanel Islands Santa Rosa U. I. santarosae San Miguel U. I. littoralis San Nicolas U.I. dickeyi Southern Channel Islands San Clemente U.I. clementae Santa Catalina U.I. catalinae The island fox shares a common ancestor with the gray fox. Urocyon cinerecargenteus, which is found on the mainland. Both species have similar coloration and a diploid chromosome number of 66. One structural difference between the two species is the reduced size of the island fox, a feature known as dwarfism. The various island subspecies also differ from each other in size, number of tail vertebrae, and other characteristics The…
Redraw the phylogeny of eukaryotes, expanded to show different members (e.g. dinoflagellates, diatoms) of the supergroups as necessary and indicate the location of the primary endosymbioses for mitochondria and chlorophyll on the phylogeny. Indicate the location of three secondary endosymbioses leading to chloroplasts and one location showing the loss of mitochondria on the same phylogeny.

Chapter 28 Solutions

BIOLOGY(LL)-W/ACCESS CODE >CUSTOM<

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