The Chordates

question 22

Multiple Choice

The chordates

• A) all have a bony backbone.
• B) include some animals without a nervous system.
• C) pass through a developmental stage with pharyngeal slits.
• D) are poorly represented in the fossil record.
• E) are all filter feeders.

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Definitions:

Genetic Siblings

Siblings who share both biological parents and have a high degree of genetic similarity.

Fraternal Twins

Twins that develop from two different eggs fertilized by two different sperm, resulting in siblings that are genetically similar but not identical.

Phenotype

The observable characteristics or traits of an organism, resulting from the interaction of its genetic makeup with the environment.

Genotype

The genetic makeup of an individual, including all inherited genes, which can influence characteristics and disease risk.