On a voyage to the ocean bottom, a biologist discovers a...

Name: Problem 12, Chapter 31: Biology: The Dynamic Science
Uploaded: 2021-09-17T03:37:28-08:00
Duration: 1 min 58 s
Channel: Joanna Quigley
Description: On a voyage to the ocean bottom, a biologist discovers a worm that appears to be new to science. What characteristics of this animal should the biologist examine to determine whether or not she has discovered a previously undescribed phylum?

On a voyage to the ocean bottom, a biologist discovers a worm that appears to be new to science. What characteristics of this animal should the biologist examine to determine whether or not she has discovered a previously undescribed phylum?

Key Concepts

Molecular Phylogenetics

The use of genetic data, particularly DNA sequencing, allows researchers to compare genetic markers across different organisms. Molecular phylogenetic analyses help determine evolutionary relationships and can provide evidence of a distinct lineage that merits recognition as a new phylum.

Developmental Biology

Developmental characteristics, such as the pattern of early embryonic cell divisions, germ layer formation, and overall embryogenesis, are critical as they often reflect deep evolutionary relationships. Significant differences in developmental pathways may suggest that an organism belongs to a new phylum.

Taxonomic Classification

This involves classifying organisms into a hierarchical structure based on shared characteristics. Determining a new phylum requires a thorough analysis of whether the organism's features are fundamentally different from those defining all known phyla, including comparisons of morphology and developmental processes.

Body Plan

The body plan refers to the overall structural organization of an animal, including aspects such as symmetry (bilateral, radial), segmentation, and the arrangement of tissues and organs. A unique or radically different body plan may indicate that the organism represents a distinct phylum.

Morphology

Morphological analysis entails examining the form, structure, and anatomical features of an organism. For phylum determination, both external and internal morphological characteristics are scrutinized to see if they align with or diverge from those in established phyla.

Transcript

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