Cystic fibrosis is caused by the allele f, which is completely recessive to the normal dominant allele F. Consider a couple who both have the genotype Ff. What is the chance that their first child will develop cystic fibrosis?
A) 0%
B) 25%
C) 50%
D) 75%
B
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The figure above represents tRNA that recognizes and binds a particular amino acid (in this instance, phenylalanine). Which codon on the mRNA strand codes for this amino acid?
A) UGG B) GUG C) GUA D) UUC E) CAU
Rapid turgor pressure changes in specialized multicellular swellings called ________ are associated with leaves that move in response to touch or light.
A. pudicas B. pulvini C. petioles D. stipules E. coleoptiles
Today, the fossil record
A. can be dated reasonably well only with uranium-238. B. can be dated precisely, to within a single year, using DNA hybridization. C. can be dated precisely, to within a single year, using radioactive isotopes. D. can be dated reasonably well using a variety of radioactive isotopes with known half-lives. E. can be dated only in terms of how layers relate to each other (i.e. older layers are below younger layers); no actual dates can be estimated.
George is experiencing problems with damaged cartilage in his knee and is eating cartilage from the bones of his steak so that his knee will more readily heal. Explain why he is not necessarily going to succeed in speeding up the repair of his knee
What will be an ideal response?