Phenotypes and proportions

[curious1234]

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 (1-0.35) when the problem states the distance between P and Q is 35mu ? Why do we calculate 1-0.35 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?

[mith]

35 mu means 35% are recombinants therefore 65% are parental genotypes. therefore parentals percentalge

PQ + pq = (1-0.35).

[curious1234]

Thanks!

[lozerface16]

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!!

[MrMistery]

well you need to know how the gene is transmitted, and if there is complete dominance between the alleles which one is the dominant one.