If a person has a recessive allele for a disorder and that allele is masked by the presence of a normal dominant allele, this person
A. is homozygous for the disease.
B. cannot produce gametes.
C. has the disease but cannot pass this disease to their offspring.
D. is termed a carrier.
E. is termed a linkage group.
D. is termed a carrier.
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Of the following, the best conclusion concerning the difference between the S phases for beta and gamma is that _____
A) gamma contains more DNA than beta B) beta and gamma contain the same amount of DNA C) beta cells reproduce asexually D) beta are in the G0 phase E) beta is a plant cell and gamma is an animal cell
A particular gene is 13,066 nucleotides long. This is
A) about 1.3 microbases. B) about 13 kilobases. C) about 1.3 megabases. D) about 3,011 amino acids.
Which of the following statements about symbiotic relationships are true? Check all that apply.
_____ Plant-pollinator interaction is a good example of mutualism. _____ Both mutualisms and commensalisms result from the process of coevolution. _____ It is sometimes difficult to determine if a specific relationship is mutualism, commensalism, or parasitism. _____ Parasites can sometimes influence the behavior of their hosts to facilitate completion of their life cycles. _____ Mutualists sometimes become parasites.
Myotonic muscular dystrophy generally affects
a. the entire body. b. the hands and feet. c. the back muscles. d. the neck muscles. e. the abdominal muscles.