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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332

Solutions

Chapter
Section
BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332
Chapter 21, Problem 8SQ
Textbook Problem
62 views

To reproduce sexually, two ciliates join and _____.

  1. a. infect cells
  2. b. form spores
  3. c. emit light
  4. d. exchange micronuclei

Summary Introduction

Concept Introduction: Ciliates are a diverse group of heterotrophs that live anywhere there is water. Macronucleus and micronucleus are the two types of nucleus present in cilia. The macronucleus is a large polyploidy nucleus that controls the daily function. In the asexual reproduction of ciliates, the macronucleus undergoes mitosis division. The micronucleus is the smaller nucleus that functions in the sexual reproduction.

Explanation of Solution

Reasons for correct statement:

The micronucleus present in the ciliates functions in the sexual reproduction. During the reproduction, the ciliates get together and their micronuclei undergo meiosis. The cells swap one of their haploid micronuclei and use their new combination of micronuclei to form macronucleus with a mixed genome. When the cells separate, each divides and passes a macronucleus with a mix of genes to its daughter cells.

Option d. is given as “exchange micronuclei”. As the two ciliates join and exchange micronuclei during their sexual reproduction, option d. is correct.

Reasons for the incorrect statements:

Option a...

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