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

Biology & Microbiology

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The expression of ABC genes _____

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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

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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

Biology & Microbiology