a short pea plant is crossed with a tall heterozygous P plant. Use, opponent square to determine the probability of short offspring.

Answer 1

To determine the probability of short offspring from a cross between a short pea plant and a tall heterozygous pea plant, we need to use a Punnett square.

1. Define the alleles:

   • Let \( T \) represent the tall allele (dominant).
   • Let \( t \) represent the short allele (recessive).

2. Parent Genotypes:

   • The short pea plant has the genotype \( tt \).
   • The tall heterozygous pea plant has the genotype \( Tt \).

3. Set up the Punnett square:

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

4. Analyze the outcomes:

   • From the Punnett square, the possible genotypes of the offspring are:
     • \( Tt \) (tall) - 2 out of 4
     • \( tt \) (short) - 2 out of 4

5. Calculate the probabilities:

   • Probability of tall offspring (\( Tt \)): \( \frac{2}{4} = \frac{1}{2} \) or 50%
   • Probability of short offspring (\( tt \)): \( \frac{2}{4} = \frac{1}{2} \) or 50%

Conclusion: The probability of obtaining short offspring from this cross is 50%.