Chapter 25: Q25.2-2CC (page 545)
Why is it likely that Hox genes have played a major role in the evolution of novel morphological forms?
The Hox gene plays an important role by providing positional information and embryonic developmental structures of an embryo for the evolution of morphological forms.
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A swim bladder is a gas-filled sac that helps fish maintain buoyancy. The evolution of the swim bladder from the air-breathing organ (a simple lung) of an ancestral fish is an example of
(A) exaptation.
(B) changes in Hox gene expression.
(C) paedomorphosis.
(D) adaptive radiation
What evidence supports the hypothesis that mitochondria preceded plastids in the evolution of eukaryotic cells?
Count the number of new species that form in each group beginning at 60 mya (the first three species in each group were present around 64 mya, the first time period sampled, so we don’t know when those species first appear in the fossil record).
How would the appearance of protocells have represented a key step in the origin of life?
Which of the following steps has not yet been accomplished by scientists studying the origin of life?
(A) synthesis of small RNA polymers by ribozymes
(B) formation of molecular aggregates with selectively permeable membranes
(C) formation of protocells that use DNA to direct the polymerization of amino acids
(D) abiotic synthesis of organic molecules.
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