Question

the diagram shows a single punnett square that represents a cross between parents in offspring. using the diagram, what is the percent chance that the offspring are homozygous dominant for the trait? a 25% b 50% c 75% d 100%

Explanation:

Step1: Identify homozygous - dominant genotype

The homozygous - dominant genotype is TT.

Step2: Count total genotypes and TT genotypes

There are 4 total genotypes in the Punnett - square (TT, Tt, Tt, tt) and 1 TT genotype.

Step3: Calculate percentage

The percentage is calculated as $\frac{\text{Number of TT genotypes}}{\text{Total number of genotypes}}\times100\%=\frac{1}{4}\times100\% = 25\%$.

Answer:

A. 25%