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What are the possible outcomes of the following cross?

\begin{tabular}{|l|l|l|}
\hline & [tex]$T$[/tex] & [tex]$t$[/tex] \\
\hline [tex]$T$[/tex] & & \\
\hline [tex]$t$[/tex] & & \\
\hline
\end{tabular}

A. TT and ttonly

B. [tex]$T T, t t$[/tex], and [tex]$T t$[/tex]

C. ttonly

D. TT only

Sagot :

GinnyAnswer
To determine the possible outcomes of a genetic cross where one parent has genotype \( Tt \) (one dominant allele \( T \) and one recessive allele \( t \)) and the other parent has the same genotype \( Tt \), we can use a Punnett square.

Here is the setup of the Punnett square:

[tex]\[ \begin{array}{|c|c|c|} \hline & T & t \\ \hline T & TT & Tt \\ \hline t & Tt & tt \\ \hline \end{array} \][/tex]

Now, let's fill in the Punnett square step by step:

1. The top row of the square represents the alleles from one parent: \( T \) and \( t \).
2. The first column represents the alleles from the second parent: \( T \) and \( t \).

To fill in the squares:

- The top-left square combines the \( T \) from the first parent with the \( T \) from the second parent, resulting in \( TT \).
- The top-right square combines the \( T \) from the first parent with the \( t \) from the second parent, resulting in \( Tt \).
- The bottom-left square combines the \( t \) from the first parent with the \( T \) from the second parent, resulting in \( Tt \).
- The bottom-right square combines the \( t \) from the first parent with the \( t \) from the second parent, resulting in \( tt \).

So, the filled Punnett square looks like this:

[tex]\[ \begin{array}{|c|c|c|} \hline & T & t \\ \hline T & TT & Tt \\ \hline t & Tt & tt \\ \hline \end{array} \][/tex]

From the Punnett square, we can see that the possible outcomes of the cross are:
- \( TT \)
- \( Tt \)
- \( Tt \) (which is the same as \( Tt \) above, but counted twice for clarity)
- \( tt \)

Since \( Tt \) results in the same genotype regardless of parent order, we can conclude the unique possible outcomes are:
- \( TT \)
- \( Tt \)
- \( tt \)

Now, let's match these outcomes with the given choices:
- Choice A: TT and tt only. This is incomplete because it does not include \( Tt \).
- Choice B: \( TT \), \( tt \), and \( Tt \). This is correct because it includes all the possible outcomes.
- Choice C: tt only. This is incorrect because it does not include \( TT \) and \( Tt \).
- Choice D: TT only. This is incorrect because it does not include \( tt \) and \( Tt \).

Thus, the correct answer is:

B. [tex]\( TT, tt, \)[/tex] and [tex]\( Tt \)[/tex]
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