Comparative Embryology

When scientists see similarities between a hippopotamus embryo and a rabbit embryo, this suggests:

• Rabbits evolved from hippopotamus.

• Hippopotamus share a common ancestor with rabbits.

• Hippopotamus evolved from rabbits.

• Hippopotamus and rabbits share the same traits.

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An embryo can include the following.

• A plant in the early stages of development.

• A bacteria in the early stages of development.

• An animal in the early stages of development.

• A newly hatched egg.

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How does embryology support the Theory of Evolution?

• It shows that embryos who develop similarly share a common ancestor

• It shows that embryos who develop similarly are not related to one another

• It shows that organisms have the ability to evolve, or change, over time

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In the the third embryonic stage (bottom row), mammal embryos _____

• have more characteristics in common with each other than with reptiles or birds.
• are still hard to tell from reptiles and birds.
• have the same features as fish, reptiles, and birds.
• do not have tails.

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When vertebrates are in the early stages of development (an embryo) they all possess....

• gill slits and tails

• backbone and hands

• hands and feet

• tongue and mouth

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What is an embryo?

• An early stage of development of a multicellular organism.

• A sex cell that begins to grow and diversify.

• The genome of an organism before birth.

• The fluid sac surrounding a developing organism in its earliest stages.

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The most recent ancestral form or species from which two different species evolved is known as ________________________.

• a common ancestor.
• an embryonic stage.
• development.
• evolution.

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Common ancestry relates to evolution because

• evolution only happens when there are common ancestors.
• Common ancestors make evolution happen more quickly.
• evolution can never take place with common ancestors.
• the more two organisms have in common, the more recent is their common ancestor during their evolution.

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In stage one (top row) of these embryos, most of the embryos________

• look very similar.
• have very different features.
• show different stages of development.
• have only a tail if they are non-human.

In stage 2 (middle row) fish embryos _________

• are very different from bird and mammal embryos.

• are still very similar to bird and mammal embryos.

• show arm and leg buds.

• are the only embryos with tails.

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