Campbell Biology (10th Edition)
Campbell Biology (10th Edition)
10th Edition
ISBN: 9780321775658
Author: Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Robert B. Jackson
Publisher: PEARSON
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Chapter 28.3, Problem 3CC
Summary Introduction

To determine: Which among the 3 lifecycles (Refer to Fig.13.6 “Three types of sexual lifecycles”, in the textbook) possess “alternation of generation”. Discriminate it with the other 2 lifecycles.

Concept introduction: Many lifecycles have been evolved among the algae (multicellular). The life cycle that is complex includes the alternation of generation. It means there is alternation between the multicellular diploid or the haploid forms. Thus, alternation of generation is applied to only those lifecycles, where the diploid as well as haploid, both stages exists.

Pictorial representation:

Sexual lifecycles of various organisms is represented in Fig.1.

Campbell Biology (10th Edition), Chapter 28.3, Problem 3CC

Fig.1 “Three types of sexual lifecycles”

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. What is the total number of chromosomes this organism has? • What is the haploid number (n) of this organism? ID each unique shape with a number.... • Is this organism haploid, diploid, triploid, or tetraploid? Put the letter "a" by those chromosomes from one parent and the letter "b" by those from another. 11 • Draw in duplicated chromosomes now....imagine we're in prophase of mitosis... • What is the difference between • 5A vs. 5B? ● 5A vs. 5A copy?

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Campbell Biology (10th Edition)

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