If offspring exhibit a 3:1 phenotypic ratio, what are the genotypes of the parents? __________________
Fill in the blank(s) with the appropriate word(s).
Answer: Aa Aa
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Which of the following would most likely contribute to uncontrolled cell proliferation (i.e., cancer)?
A. a mutant CDK that was active in the absence of its cyclin binding partner B. a mutant cyclin that cannot bind to its normal CDK binding partner C. a mutant microtubule synthesis/polymerization enzyme D. a mutant DNA replication mechanism causing extra chromosome copies E. a mutant kinetochore protein that causes reduced microtubule attachment
Plant cells have a ridged cell wall. How do plant cells expand, and how important is cell expansion to
plant growth?
What will be an ideal response?Where do the megaspores develop in pine trees?
a. within an ovule b. within a strobilus c. within a sporopollenin d. within a seed
The excretory structures of terrestrial arthropods are slender projections from the digestive tract that are attached at the junction of the midgut and hindgut. These are called
A. flame cells. B. Malpighian tubules. C. ocelli. D. kidneys and bladders. E. nephridia.