Final answer:
The expected frequency of tall, yellow, wrinkled plants in the F2 generation, given the dominance of tall, yellow, and round traits over dwarf, green, and wrinkled, is 9/64, as calculated by the forked-line method and the concept of independent assortment.
Step-by-step explanation:
The question asks about the expected frequency of tall, yellow, wrinkled plants in the F2 generation when crossing true-breeding tall, yellow, round plants with true-breeding dwarf, green, wrinkled plants, given that tall, yellow, and round traits are dominant. Using the forked-line method, we can calculate the probability of obtaining the desired phenotype by multiplying the probability of each individual trait. The probability for being tall (T) from a cross between two heterozygotes (Tt) is 3/4, as tall is dominant. Now, this is combined with the independent assortment probabilities of seed color and texture. The proportion of yellow (Y) offspring is 3/4 and the proportion of wrinkled (r) offspring is 1/4. Multiplying these gives (3/4) x (3/4) x (1/4), which equals 9/64. Thus, the expected frequency of tall, yellow, wrinkled plants in the F2 generation is 9/64.