Multiple Choice
In Mendel's experiments, a two-factor cross is one in which an experimenter follows the inheritance of:
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2. Mendel's Laws of Inheritance
Mendel's Experiments and Laws
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Mendel's pea plants had either purple or white flowers. This means that the plants:
A
had multiple alleles controlling flower color
B
exhibited discrete variation in flower color
C
showed incomplete dominance for flower color
D
displayed continuous variation in flower color
Verified step by step guidance1
Understand the concept of discrete variation: it refers to traits that have distinct, separate forms with no intermediates, such as purple or white flowers in Mendel's pea plants.
Recognize that multiple alleles controlling a trait means more than two forms of a gene exist, which is not the case here since Mendel observed only two flower colors.
Recall that incomplete dominance results in intermediate phenotypes (e.g., pink flowers from red and white parents), which Mendel did not observe for flower color.
Know that continuous variation involves a range of phenotypes with gradual differences, like height or skin color, which does not apply to the clear-cut flower colors Mendel described.
Conclude that Mendel's pea plants exhibited discrete variation in flower color because the flowers were either purple or white with no intermediates.
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