What Evidence Supports the Ohno Suggestion About Vertebrate Evolution from Ancestral

question 18

Multiple Choice

What evidence supports the Ohno suggestion about vertebrate evolution from ancestral invertebrates by whole-genome duplication?

• A)Modern vertebrates have four times the number of certain groups of genes compared to their homologues in Amphioxus.
• B)Modern vertebrates and Amphioxus have exactly the same number of certain groups of genes.
• C)Modern vertebrates have six times the number of certain groups of genes compared to their homologues in Amphioxus.
• D)Amphioxus has four times the number of certain groups of genes compared to their homologues in modern vertebrates.
• E)Amphioxus has eight times the number of certain groups of genes compared to their homologues in modern vertebrates.

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Definitions:

ANS Neurons

Autonomic nervous system neurons are specialized cells that control involuntary body functions including heart rate, digestion, and respiratory rate.

Thoracic Nerves

Nerves originating from the thoracic region of the spinal cord, involved in controlling the muscles and sensation in the chest, abdomen, and parts of the back.

Filum Terminale

A slender filament of connective tissue that extends from the bottom of the spinal cord and anchors it within the vertebral column.

Conus Medullaris

The tapered, lower end of the spinal cord, found at the level of the first and second lumbar vertebrae.