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.

10. A student had hypothesized that the majority of the offspring from Cross 3 would be tall and have white flowers.Are the results shown in Table 3 consistent with this hypothesis?

Answer and Explanation

Your Answer is

Correct Answer is J

Explanation

Look at the number of descendants of tall & white flower in table 3 is 11+20=31, and the total number of descendants is 10+18+11+19+41+20+12+19+10=160, so tall & white The proportion is 31/160≈19.4%, which cannot be considered a majority, so choose No