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Which statement is NOT a reason why homologous structures may look very different when comparing two different species? |
The homologous structures may have arisen independently in the two species that are closely related |
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The forelimb of a chicken and a primate contain many of the same bones arranged in the same order. This is an example of _____. |
homology |
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The variation in shape and function of the forelimb in tetrapods is a result of _____. |
different environments leading to the evolution of different types of limbs |
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What can we learn about vertebrate evolution from Tiktaalik that we did not know before? |
how vertebrates evolved tetrapod limbs |
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Organism XYZ has a DNA sequence of GGTATAGAGT. By examining the sequence of nucleotides below, determine which organism is most closely related to organism XYZ |
GGTATAGAGG |
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Which scenario would be LEAST likely to result in a fossil? |
a jellyfish that dies and slowly floats to the ocean floor |
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Although all organisms share the same four nucleotides, it is the _____ of these nucleotides that makes each species unique |
sequence |
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A transitional fossil should _____ |
share some similarity with species that lived before it and some similarity with species that lived after it. |
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Shubin and Daeschler specifically traveled to Ellesmere Island to hunt for fossils because _____ |
the rocks on the island were of the right age to contain transitional vertebrate fossils |
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Which of these is NOT used by scientists to understand evolution? |
religion |
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Some portions of DNA function as a kind of evolutionary clock when comparing two different species because _____ |
mutations accumulate at a known rate |
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The Tiktaalik fossil, which dates back 375 million years, is considered a transitional fossil because _____ |
it displays features found on both aquatic and land-dwelling species |
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Which change in the evolutionary history of horses is documented by the fossil record? |
a gradual decrease in the number of toes |
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Which statement regarding the dating of fossils is false? |
Fossils can be dated using a microscope to examine tissue. |
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Which sequence places Tiktaalik in the correct evolutionary order? |
lobe-finned fish, Tiktaalik, tetrapods |
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Which feature did Tiktaalik possess that were not possessed by earlier vertebrates? |
a flexible wrist |
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Fossils are generally going to be more useful for studying animals that lived in or near water (e.g., streams, lakes, oceans, etc.) because |
dead animals that fall into water are more likely to be in conditions that allow fossilization |
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