In a monohybrid cross, if the gene for tall (T) plants was incompletely dominant over the gene for short (t) plants, what would be the predicted result of crossing two intermediate (Tt) parent plants? (Hint: You may want to complete a Punnett square.)

-25 percent tall, 50 percent intermediate, 25 percent short

-50 percent tall, 25 percent intermediate, 25 percent short

-25 percent tall, 75 percent intermediate

Question

In a monohybrid cross, if the gene for tall (T) plants was incompletely dominant over the gene for short (t) plants, what would be the predicted result of crossing two intermediate (Tt) parent plants? (Hint: You may want to complete a Punnett square.) 

 -25 percent tall, 50 percent intermediate, 25 percent short

 -50 percent tall, 25 percent intermediate, 25 percent short

 -25 percent tall, 75 percent intermediate

aaronq · Answer

draw a punnett square

anonymous · Answer

|dw:1376861458596:dw| 
like that?

anonymous · Answer

thats how my brother told me to do it, but im not sure

aaronq · Answer

thats exactly it

anonymous · Answer

So you have the Punnett Square. 

Question: Did your brother make this Punnett Square for you? Or did you do it? 

Because if you don't know how to make a Punnett Square for yourself, 
then I can show you how it was done, 
and what all the letters mean.

anonymous · Answer

he showed me how to create and to put the letters in the right boxes but he never explained it, thats why I'm not sure.

anonymous · Answer

Okay. 

Here's your Punnett Square: 

|dw:1376978910772:dw|

The PAIRS of letters are called "genotypes." 
That means that each genotype is made up of two alleles (letters). 

When we make a Punnett Square, 
we first start off with the genotypes of each of the two parents. 

The genotype of the first parent goes on TOP. 
The genotype of the second parent goes on the LEFT side. 
You see? 

After that, we fill in each of the four boxes with the genotypes of the children. 

Again, genotypes are two letters. 
And each child gets one letter from each parent. 

So, first, we pick a box. 
We take the letter all the way at the TOP of that box. 
And we also take the letter all the way to the LEFT of that box. 
So in the end, we have two letters, for the child's genotype. 

Here, I'll show you a different Punnett Square that I've made up: 

|dw:1376979405375:dw|

In my Punnett Square, we have two parents: 

(A a)....and.....(A A) 

If these two parents were to reproduce, and make children, 
then their children could have two possible genotypes -- (A A) or (A a). 
That's what the Punnett Square shows us, after we fill it in. 

You see?