Question

A tall, purple flower plant with genotype Tt Pp is crossed with a tall, white flower plant of genotype Tt pp. What is the probability of obtaining progeny with genotype TTpp?

1) 1/8
2) 1/4
3) 1/2
4) 2/3
5) 3/4

Answer 1

The probability of obtaining progeny with genotype TTpp from a cross between pea plants with genotypes Tt Pp and Tt pp is 1/8, as determined by constructing a Punnett square for each trait. The correct option is 1) 1/8

Step-by-step explanation:

The question involves calculating the probability of obtaining a specific genotype from a cross between two pea plants with known genotypes using Mendelian genetics. We are given the genotypes Tt Pp (tall, purple flower) and Tt pp (tall, white flower) and asked to find the probability of progeny with genotype TTpp. To calculate this, a Punnett square is constructed for each trait (height and flower color) separately, considering tall (T) is dominant to short (t), and purple (P) is dominant to white (p).

For height (Tt x Tt), the possible genotypes are 1/4 TT, 1/2 Tt, and 1/4 tt. For flower color (Pp x pp), the possible genotypes are 1/2 Pp and 1/2 pp. Combining these probabilities for the desired genotype TTpp, we get (1/4 TT) x (1/2 pp) = 1/8. Therefore, the probability is 1/8. The correct option is 1) 1/8