A married couple, both of whom are heterozygous for the cystic fibrosis gene, seek your counsel concerning the probability of their having a child with the cystic fibrosis disease. Using a Punnett Square, determine the probability

Question

anonymous · Answer

Do you know how to make a Punnett Square? 

Because I can tell you that cystic fibrosis is a recessive phenotype. A recessive disorder.

anonymous · Answer

Ya but they do not want that tho. A married couple, both of whom are heterozygous for the cystic fibrosis gene, seek your counsel concerning the probability of their having a child with the cystic fibrosis disease. Using a Punnett Square, determine the probability and then write a paragraph explaining their predicament in full detail.

anonymous · Answer

Yes I read all of that. 

If you make a Punnett Square, using the information that I gave you, then you will have your answer. 

Do you know how to make a Punnett Square?

anonymous · Answer

Let's start here:

If both parents are heterozygous for the cystic fibrosis gene, 
what are both of their genotypes? 

We need to know their genotypes before we make the Punnett Square.

anonymous · Answer

Right, but they do not tell me that. I guess I can make it up.

anonymous · Answer

I'm not asking for what they tell you. 

I'm asking for your answer. 

You can use any letters you want, to represent the alleles for the phenotype.

anonymous · Answer

Do you know what "heterozygous" means?

anonymous · Answer

Yes, I know what it means.

anonymous · Answer

Okay. So now we need a letter of the alphabet, to represent the alleles. 

Let's use the letters ( A ) and ( a ). 

( A ) represents a normal gene. 
( a ) represents a mutated gene. 

If both of the parents are heterozygous, 
what are their genotypes?

anonymous · Answer

Do you know what a "genotype" is?

anonymous · Answer

The genotype is the genetic makeup of a cell, an organism, or an individual

anonymous · Answer

Yes, that's the definition of "genotype." 

So, can you tell me what the genotypes of the parents are going to be?

anonymous · Answer

Listen, I know what the question is asking for. 

And I think it's pretty obvious I'm not going to just give you the answer. 
But I'm trying to lead you to the answer. Step by step. 

Are you going to work with me?