Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892



Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

Apply Evolutionary Thinking The nematodes Caenorhabditiselegans and Caenorhabditisbriggsae are both hermaphroditic. Phylogenetic evidence indicates that the last common ancestor of these two species had a normal male–female mechanism of reproduction. What does this evidence suggest about their hermaphroditism?

Summary Introduction

To review:

The phylogenetic evidence that suggests about hermaphroditism of nematodes Caenorhabditis elegans and Caenorhabditis briggsae.


Hermaphroditism is a condition in which, during the time of sexual reproduction, either partner can act as “male” or “female.” The hermaphroditic plants are most of the flowering plants such as angiosperms, and there are some hermaphroditic animals like invertebrates such as worms, snails, and slugs.


Caenorhabditis elegans belongs to the phylum nematodes and they are commonly known as roundworms. Caenorhabditis elegans is a free-living, small nematode worm useful for studying developmental biology. It is also known as pseudocoelomate and has an unsegmented body. Caenorhabditis briggsae are small soil nematodes. They are found closely related to Caenorhabditis elegans and C. briggsae diverged from the C...

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