In a certain breed of chicken, two genes control color. A dominant allele (I) inhibits the expression of
any color gene (C). A second recessive gene (c) results in albinism when homozygous (cc). Give the
F2 phenotypic ratio of a colored chicken ii CC with a white II cc. What will be an ideal response?
ANS: 9 I__C__ + 3 I__ cc + 1 ii cc = 13 white + 3 ii C__ = 3 color
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Avery, MacLeod, and McCarty's experiments revealed that the transforming principle had all of the following properties except
A. its activity was destroyed by treatment with proteases. B. its activity was unaffected by RNA-digesting enzymes. C. its activity was unaffected by lipid extraction. D. its activity was destroyed by treatment with DNA endonucleases.
The expression of ABC genes _____
a. occurs in layers b. controls flower formation c. causes mutations in flowers d. occurs in layers and control flower formation
Which of the following indicates a relationship in which resident microorganisms prevent the overgrowth of intruder microorganisms when competing for survival in a common environment?
a. Microbial antagonism b Microbial commensalism c. Microbial mutualism d. Microbial synergism
The genus Bdellovibrio ________.
A. prey on Gram-negative bacteria by becoming an intracellular parasite B. are responsible for causing diarrhea in humans C. form long filaments called trichomes D. use reduced sulfur compounds as a source of energy