Comparing Embryos

In stage 2 (middle row) fish embryos _________

• are very different 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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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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Which of the following do scientists as evidence to support the theory of evolution?

• DNA similarities

• Comparing early stages of embryos

• Comparing organisms' body structures

• Studying the fossil record

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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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Images of the embryo and adult stages of three different organisms are shown.

Which of the following is the best conclusion that can be drawn from this evidence?

• Having similar embryos indicates that these organisms eat the same types of food.

• Having similar embryos indicates that these organisms live in a similar environment.

• Having similar embryos indicates that these organisms share a recent common ancestor.

• Having similar embryos indicates that a certain protein controls how many legs the adult organisms will have.

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Various species show similar developmental patterns as embryos.

• DNA similarities

• Anatomical Homology

• Embryology

• All of the above

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Organisms that are closely related may also have physical similarities before they are even born. Take a look at the six different embryos below. Hypothesize which embryos is the Human, Chicken, Rabbit, Tortoise, Salamander, and Fish

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These are older, more developed embryos from the same organisms. Does this change your Hypothesis? If so, write your changes below.

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These are embryos at their most advanced stage, shortly before birth. Make your last hypothesis for each embryo. It should be easier to tell which embryo is going to develop into which animal.

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Which of the following is a key reason why scientists compare embryos of different species?

• To identify genetic mutations

• To understand evolutionary relationships

• To study adult organism behavior

• To classify organisms by size

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