Rice plants may be tolerant or intolerant to flooding. A true-breeding tolerant plant was crossed with a true-breeding

intolerant plant, and approximately 75% of the F1 generation was tolerant to flooding. What does this most likely suggest
about the flood-tolerant and flood-intolerant alleles?



a. Multiple alleles control flood-tolerance.
b. The alleles for flood-tolerance and flood-intolerance are codominant.
c. The allele for flood-tolerance is incompletely dominant.
d. The allele for flood-intolerance is dominant, while the allele for flood-tolerance is recessive.
e. The allele for flood-tolerance is dominant, while the allele for flood-intolerance is recessive.


ANSWER: e

Biology & Microbiology

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