Question

Analyze the results of a cross between two organisms that are both heterozygous for two different genes (AaBb). Use a Punnett square to evaluate the possible genotypes. (1) List all the genotypes from your Punnett Square in the answer space. (2) Determine how many phenotypes can be produced in the offspring. (3) Determine the probability of producing offspring with the aabb genotype.

Answer 1

Have you tried anything yet? Post how much you have tried.

Answer 2

I have tried but I cant figure out how to create the punnett square, that's the part I need hep with

Answer 3

@neonumbrella5115

Answer 4

So you will make a square that shows all the possible combinations of the genes. So each parent is AaBb meaning in a gamete there are 4 possible combinntons. AB Ab Ba ba

Answer 5

So your  Punnet square will be a four by four with those gamete possibilities labeling each column and row with a different gamete

Answer 6

I'll draw it if you give me a bit more time.

Answer 7

like this

Answer 8

okay, thank you:)

Answer 9

Thank you:) so it has 4 different genotypes, 8 pheyotypes can be made from the offspring, and the last question I don't understand

Answer 10

@neonumbrella5115

Answer 11

So when you fill in the rest of the punnent square, how many were aabb?

Answer 12

8 if you count a the different squares @neonumbrella5115

Answer 13

I messed up setting up the Punnet square instead of "bA" it should be ba

Answer 14

oh okay so just 4

Answer 15

@neonumbrella5115

Answer 16

Can you show me how you got 4? 4 is incorrect, and I am confused on how you got there. The answer should be one because the bottom left corner of the punnent square is the only one that has both recessive traits.

Answer 17

but there is four, Ab ab Ba ba

Answer 18

@neonumbrella5115 I m confused at how many different genotypes and the different phenotypes can be produced. I don't understand how you got 1

Answer 19

I think what's going on is you're separating the two genes. I'm pretty sure it should look more like AaBb rather than Aa and Bb. Thoughts, @neonumbrella5115 ?

Answer 20

@ggw513 and @neonumbrella5115 can either help me understand the genotypes and phenotypes?

Answer 21

Sure :) genotypes are the alleles you carry, while phenotypes are the alleles you express.

Answer 22

Or are you confused about something else..?

Answer 23

Okay so that would mean in AaBb, there are four genotypes?

Answer 24

I'm not sure.. I'm still trying to work it out.

Answer 25

So I was answering question 3. Sorry if I confused you! :)

Answer 26

@neonumbrella5115 its okay:) so would this be the right answrs?

1. Genotypes; AB, Ab, aB, ab

2. Four phenotypes can be produced in the offspring

3. Probability; 25%

Answer 27

or is the #1 AABB, AABb, AAbb, AaBB, AaBb, Aabb, aaBB, aaBb, aabb.

Answer 28

^ I'd go with that

Answer 29

The second one

Answer 30

I used a punnett square and got your second answer

Answer 31

okay @ggw513 and would it still be four phenotypes?

Answer 32

Yes :) that's correct. Oh, and 3 would be 1/16 because out of all 16 combinations there is one aabb combo.

Answer 33

That's what I got the second time but I was still confused. Thank you o much @ggw513 if you ever need hel I am here:) How did you do on your finals? btw

Answer 34

@ladybugchasylou I'm not 100% sure yet, because I haven't gotten my essay questions graded, but I think I did really well :)