Question

As per Mendel, which one of the following genotype will express tall stem and wrinkled seeds in peas?

• A. TTRR
• B. ttRR
• C. TTrr
• D. ttrr

Hint:

Mendel's laws of inheritance state that dominant alleles mask the expression of recessive alleles, leading to the phenotypic expression of dominant traits.

Answer 1

The Correct Option is C

According to Mendel's laws of inheritance, the genotype for the tall stem is represented by the dominant allele \( T \), and the genotype for the wrinkled seeds is represented by the recessive allele \( r \). Therefore, the correct genotype for expressing tall stem and wrinkled seeds must have at least one dominant \( T \) and two recessive \( r \) alleles. The genotype that fits this requirement is \( TTrr \).

Step 1: Analyzing option (A).
Option (A) \( TTRR \) would express tall stems and round seeds, as both traits are controlled by dominant alleles.

Step 2: Analyzing option (B).
Option (B) \( ttRR \) would express short stems and round seeds, as the stem length is controlled by the \( T \) allele and the seed shape is controlled by the \( R \) allele.

Step 3: Analyzing option (D).
Option (D) \( ttrr \) would express short stems and wrinkled seeds, as both traits are controlled by recessive alleles.

Step 4: Conclusion.
Thus, the correct genotype for tall stems and wrinkled seeds is (C) \( TTrr \).