Question

the allele for tall pea plants is dominant over the allele for short pea plants. in a cross between a homozygous tall pea plant and a short pea plant, what are the possible phenotypes of the offspring?
a. 100% tall pea plants
b. 100% short pea plants
c. 50% tall and 50% short pea plants
d. 75% tall and 25% short pea plants

Explanation:

Step1: Define alleles

Let \( T \) represent the dominant allele (tall) and \( t \) represent the recessive allele (short). The homozygous tall pea plant has genotype \( TT \), and the short pea plant has genotype \( tt \).

Step2: Perform cross

When \( TT \times tt \), using Punnett square or simple allele combination:

• All gametes from \( TT \) parent are \( T \), and all gametes from \( tt \) parent are \( t \).
• The offspring genotypes are all \( Tt \).

Step3: Determine phenotype

Since \( T \) (tall) is dominant over \( t \), all \( Tt \) individuals will show the tall phenotype.

Answer:

A. 100% tall pea plants