True-breeding yellow guinea pigs crossed with true-breeding white ones produce only cream-colored offspring. This

pattern indicates incomplete dominance. Rough hair is found to be dominant to smooth hair. Give the F1 and F2 genotypic
and phenotypic ratios of a cross of a smooth, white guinea pig with a homozygous, rough, yellow guinea pig. What will be an ideal response?


ANSWER: F1: rough cream Yy Rr; F2: 3 YY R__ yellow rough, 6 Yy R__ cream rough, 3 yy R__ white
rough, 1 YY rr yellow smooth, 2 Yy rr cream smooth, 1 yy rr white smooth

Biology & Microbiology

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Biology & Microbiology

Which of the following produces pili that are subject to both phase and antigenic variation?

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Biology & Microbiology