Phenotypes and proportions
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 Garter
 Posts: 7
 Joined: Fri Jan 25, 2008 4:33 am
Phenotypes and proportions
I am trying to answer a question and I'm not sure how the book got the answer they have.
If P and Q loci are 35 mu apart, and PQ / pq is selfed what is the phenotype of the progeny and in what proportion?
I know if you cross PQ/ pq with PQ/ pq you get gamates: PQ, pq the parental and Pq pQ as the recombinants. My book says that you take 1/2(1 0.35) to get P Q, 1/2 (1  0.35) to get pq and 1/2(0.35) is Pq, 1/2(0.35) is pQ.
Why is PQ (10.35) when the problem states the distance between P and Q is 35mu ? Why do we calculate 10.35 to get 0.65 ??
Also, for the proportion of progeny they say for example that PQ/PQ has F1 genotype of 0.1056. Where does this number come from? I have no idea what numbers they use to come up with this.
Any ideas?
If P and Q loci are 35 mu apart, and PQ / pq is selfed what is the phenotype of the progeny and in what proportion?
I know if you cross PQ/ pq with PQ/ pq you get gamates: PQ, pq the parental and Pq pQ as the recombinants. My book says that you take 1/2(1 0.35) to get P Q, 1/2 (1  0.35) to get pq and 1/2(0.35) is Pq, 1/2(0.35) is pQ.
Why is PQ (10.35) when the problem states the distance between P and Q is 35mu ? Why do we calculate 10.35 to get 0.65 ??
Also, for the proportion of progeny they say for example that PQ/PQ has F1 genotype of 0.1056. Where does this number come from? I have no idea what numbers they use to come up with this.
Any ideas?

 Garter
 Posts: 7
 Joined: Fri Jan 25, 2008 4:33 am
Re: Phenotypes and proportions
Thanks!
 lozerface16
 Garter
 Posts: 7
 Joined: Sun Feb 10, 2008 5:53 pm
 Location: lozer land(far from real life) {duh}
my teacher gave me a take home test and one of the q. is
7. A female calico cat is crossed with a male black cat. What are the phenotypes of the offspring and in what proportion?
it makes no sence to me and the test mainly consists of q. like this one!
I do not understand..any of it!!
7. A female calico cat is crossed with a male black cat. What are the phenotypes of the offspring and in what proportion?
it makes no sence to me and the test mainly consists of q. like this one!
I do not understand..any of it!!
You were born an original , don't die a copy....
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