When Tt x Tt are crossed, how many percent of the offsprings show a recessive phenotype?

25%

The correct answer is Option (1) → 25%

To determine the percentage of offspring that show the recessive phenotype in a Tt × Tt cross, we can use a Punnett square for analysis.

Step-by-Step Solution:

Parental Genotypes: Both parents are Tt (heterozygous).

Possible Gametes: Each parent can produce two types of gametes—T or t.

Punnett Square:

Genotypic Ratio:

• TT = 1 (25%)
• Tt = 2 (50%)
• tt = 1 (25%)

Phenotypic Ratio:

• Dominant phenotype (T-) = TT + Tt = 75%
• Recessive phenotype (tt) = 25%