In this chapter we listed some of the traits shared by all...

Name: Problem 7, Chapter 31: Life: The Science of Biology
Uploaded: 2020-06-09T04:23:41-08:00
Duration: 2 min 38 s
Channel: Sara Ross
Description: In this chapter we listed some of the traits shared by all animals that have convinced most biologists that all animals are descendants of a single common ancestral lineage. In your opinion, which of these traits provides the most compelling evidence that animals are monophyletic?

In this chapter we listed some of the traits shared by all animals that have convinced most biologists that all animals are descendants of a single common ancestral lineage. In your opinion, which of these traits provides the most compelling evidence that animals are monophyletic?

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Key Concepts

Multicellularity

Multicellularity, especially with differentiated cells that perform specialized functions, is a fundamental trait of animals. Unlike unicellular organisms, animals organize into complex tissues and organ systems, and this organization indicates an evolutionary innovation that arose only once, reflecting a common ancestral origin.

Conserved Embryonic Development

The similarities in embryonic development across animals, such as the formation of a blastula followed by gastrulation and the establishment of germ layers, offer compelling evidence for a common origin. These developmental processes are highly conserved and suggest that all animals share a deeply rooted genetic blueprint inherited from a single common ancestor.

Monophyly

This is the concept that a group of organisms includes an ancestral species and all of its descendants, forming a single branch on the tree of life. Monophyly is central to evolutionary biology as it implies a shared common ancestry, and traits that are found across all members of a group are crucial evidence in support of this unity.

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