Question

in pea plants, the tall allele (t) is dominant to the short allele (t) and the yellow pea allele (y) is dominant to the green pea allele (y). in a cross between a ttyy pea and a ttyy pea, what are the odds that the offspring will be tall and have green peas? 1/2 1/4 1/8 1/16

Explanation:

Step1: Determine gametes

The TTYy plant can produce TY and Ty gametes. The ttyy plant can only produce ty gametes.

Step2: Use Punnett - square or probability rules

For the height trait, since one parent is TT and the other is tt, all offspring will be Tt (tall) with a probability of 1.
For the pea - color trait, Yy×yy gives a 1/2 probability of yy (green peas).

Step3: Calculate combined probability

Using the multiplication rule of independent events, the probability of being tall and having green peas is 1×1/2 = 1/2.

Answer:

1/2