To determine the phenotype ratio for the given cross, we need to first identify the possible genotypes and then determine the corresponding phenotypes.
The Punnett square is structured as follows:
[tex]\[
\begin{array}{|c|c|c|}
\hline & T & t \\
\hline T & TT & Tt \\
\hline t & Tt & tt \\
\hline
\end{array}
\][/tex]
Let's break down the genotypes and their corresponding phenotypes:
- TT: This genotype is homozygous dominant. Cats with this genotype will have short tails.
- Tt: This genotype is heterozygous. Cats with this genotype will also have short tails since short tails are dominant.
- tt: This genotype is homozygous recessive. Cats with this genotype will have long tails since long tails are recessive.
Now, let's count the number of each genotype from the Punnett square:
- TT: There is 1 square with this genotype.
- Tt: There are 2 squares with this genotype.
- tt: There is 1 square with this genotype.
Next, let's count the number of each phenotype:
- Short tail (dominant phenotype):
- 1 (TT) + 2 (Tt) = 3
- Long tail (recessive phenotype):
- 1 (tt) = 1
Therefore, the phenotype ratio for this cross is 3 short tails to 1 long tail.
So, the correct choice is:
D. 3 short, 1 long
