Campbell Essential Biology with Physiology (6th Edition)
Campbell Essential Biology with Physiology (6th Edition)
6th Edition
ISBN: 9780134711751
Author: Eric J. Simon, Jean L. Dickey, Jane B. Reece
Publisher: PEARSON
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Chapter 26, Problem 1SQ
Summary Introduction

To explain: Under which condition the rotifers and aphids are able to reproduce asexually.

Concept introduction: Living beings use two types of reproduction to produce offspring, one is asexual reproduction and the other is sexual reproduction. In asexual reproduction, only one organism is involved, and the offspring produced are genetically alike. Asexual reproduction occurs in many plants, for example spider plants, bacteria, hydra, yeast, and jellyfish. Sexual reproduction involves the fusion of male and female gametes. In this type of reproduction, two parents contribute genetic information to produce unique offspring. It occurs in most mammals, fish, reptiles, birds, and insects.

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Explanation of Solution

Rotifers and aphids reproduce both by sexually and asexually or parthenogenetically. For asexual reproduction, stable environmental conditions are most favorable conditions. Under asexual reproduction, various processes like budding and binary fission take place. In this process, genetically identical offspring are produced. These genetically identical individuals prefer to live in a same stable environment that provides the offspring a better chance to survive.

Summary Introduction

To explain: Under which condition the rotifers and aphids are able to reproduce sexually.

Concept introduction: Living beings use two types of reproduction to produce offspring, one is asexual reproduction and the other is sexual reproduction. In asexual reproduction, only one organism is involved, and the offspring produced are genetically alike. Asexual reproduction occurs in many plants, for example spider plants, bacteria, hydra, yeast, and jellyfish. Sexual reproduction involves the fusion of male and female gametes. In this type of reproduction, two parents contribute genetic information to produce unique offspring. It occurs in most mammals, fish, reptiles, birds, and insects.

Expert Solution
Check Mark

Explanation of Solution

Rotifers and aphids reproduce both by sexual reproduction and parthenogenesis. The continuous changing environmental conditions are more favorable for sexual reproduction. In autumn, aphids reproduce by sexual process and lay eggs. A change in photoperiod, temperature, and food quality and quantity causes female to reproduce parthenogenetically. Sexual reproduction takes place between males and females, which give rise to genetically different offspring. This changing environment is more suitable to reproduce genetically different offspring.

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