V) In pea plants, tall plants (T) are dominant over short plants (t). If a heterozygous tall pea

Question

plant is crossed with a homozygous recessive short pea plant, what percentage of the offspring
is expected to be tall? (HINT: set up a Punnett Square). (1 point)
0%
25%
50%
75%

Answer 1

To determine the percentage of tall offspring when a heterozygous tall pea plant (Tt) is crossed with a homozygous recessive short pea plant (tt), we can use a Punnett Square.

1. Set up the Punnett Square:

   • The alleles from the heterozygous tall plant (Tt) will be T and t.
   • The alleles from the homozygous recessive short plant (tt) will be t and t.

   The Punnett Square looks like this:

         T     |     t
       -----------------
    t |   Tt    |   tt
       -----------------
    t |   Tt    |   tt
   

2. Results of the Punnett Square:

   • The possible genotypes of the offspring are:
     • Tt (tall) - 2 squares
     • tt (short) - 2 squares

3. Calculate the percentage:

   • There are a total of 4 squares.
   • The tall plants (Tt) appear in 2 of the squares.

   Percentage of tall offspring = (Number of tall offspring / Total offspring) × 100 = (2 / 4) × 100 = 50%

Thus, the expected percentage of the offspring that is tall is 50%.