A recessive allele: Check all that apply.
A. will never have an effect on an organism's phenotype.
B. will have no noticeable effects on an organism's phenotype if a dominant allele is present.
C. will have an effect on an organism's phenotype if the individual is homozygous for the recessive allele.
D. can be on either the maternal or the paternal chromosome.
Answer: D
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A key concept in evolution is that all mutations are
A) random. B) neutral. C) deleterious. D) either deleterious or beneficial.
The minimum bactericidal concentration is the lowest concentration of a specific antimicrobial drug that kills _______ of a specific type of bacteria
A. 10% B. 50% C. 99.9% D. 100%
Acquired specific immunity involves the response of
A. skin barriers. B. interferon. C. lysozyme. D. B and T lymphocytes. E. mucus membranes.
Which of the following is false concerning eugenics?
A. The eugenics movement passed laws meant to eliminate bad genes from the human gene pool. B. Supporters of eugenics encouraged sterilization of the unfit. C. Eugenics methods have been highly successful in reducing the frequencies of bad recessive alleles from the human population. D. Eugenics methods have been unsuccessful, because recessive alleles are hidden in the heterozygous condition and can be passed on to offspring.