In key limes, the gene for round shape is completely dominant to the gene for oval shape. The seeds produced from cross-pollination and fertilization of two plants were planted. The number of plants in the second generation which produced each type of fruit is shown on the graph. What were the genotypes of the parental plants?

both homozygous dominant

both homozygous recessive

heterozygous and homozygous dominant

heterozygous and homozygous recessive

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