6. The ratio of tall offspring to short offspring in Cross 1 is closest to which of the following?
Answer and Explanation
Your Answer is
Correct Answer is H
Explanation
Directly calculate tall/short=154/46≈3:1
Passage II
Plants from Species X can be tall or short, and they can have red, pink, or white flowers. Height in Species X plants is controlled by Gene T, which has 2 alleles, T and t. Flower color in Species X plants is controlled by Gene R, which also has 2 alleles, R and r. To determine how height and flower color are inherited in Species X, a student conducted the following crosses.
Cross 1
Two tall Species X plants, each with the genotype Tt, were crossed. The numbers and phenotypes of the resulting offspring are shown in Table 1.
Cross 2
Two pink-flowered Species X plants, each with the genotype Rr, were crossed, and the numbers and phenotypes of the resulting offspring are shown in Table 2.
Cross 3
Two Species X plants, each with the genotype TtRr, were crossed. The numbers, genotypes, and phenotypes of the resulting offspring are shown in Table 3.
