Sci.9: Bundle 1 - Comparative Embryology

What is an embryo?

• An organism in the earliest stages of development before it is born or hatched

• A fully developed organism

• An organism with a backbone

• An organism with a tail

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What happens to the tail-like structure in a human embryo?

• It grows and eventually forms the tailbone

• It disappears completely

• It becomes the spine

• It becomes the bottom of the skull

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What do scientists call features like embryonic tails?

• Homologous features

• Specialized features

• Evolutionary features

• Anatomical features

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What can studying embryos help scientists with?

• Finding similarities between species

• Determining the weight of an embryo

• Identifying specialized features

• Understanding the growth of the spine

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What do pharyngeal arches develop into in humans and other mammals?

• Ear and jaw structures

• Gill structures

• Tail structures

• Spine structures

What do pharyngeal arches provide evidence of?

• All vertebrates sharing a common ancestor

• The development of specialized features

• The growth of the spine

• The evolution of tail structures

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What do more closely related species tend to share?

• More homologous features during both embryo development and after birth

• Fewer homologous features during both embryo development and after birth

• More specialized features during embryo development

• Fewer specialized features during embryo development

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