I know there is no 4 phenotypes .oooo Sprint 5:40 PM Question 1 2 pts Females wi
ID: 323471 • Letter: I
Question
I know there is no 4 phenotypes .oooo Sprint 5:40 PM Question 1 2 pts Females with the genotype hv. aremated to mains with the genotype ab/ there is not between these genesineither sex howmany phenotypes are produced in the F1?0assumeaandbare Question 2 2 pts Referring to the previous question the most frequent F1 phenotype ab Question 3 2 pts Suppose the genes a and b were 20cMapart, and recombination occurmed in females but males abe females were crossed to b males the following phenotypes would be observed ranied from mosttolcast (abl-l lino other phenotypes Question 2 ptsExplanation / Answer
Females=ab/++ or aa+bb+
Males= ab/+b or aa+bb
aa+bb+ are mated with aa+bb
Gametes from aa+bb+= a+b+, a+b, ab+ and ab
Gametes from aa+bb= a+b and ab
Now do the dihybrid cross
a+b+
a+b
ab+
ab
a+b
a+a+b+b
a+a+bb
a+ab+b
a+a bb
a+b
a+a+b+b
a+a+bb
a+ab+b
a+a bb
ab
a+a b+b
a+a bb
aab+b
aabb
ab
a+a b+b
a+a bb
aab+b
aabb
Phenotype class 1: a+a+b+b, a+a+b+b, a+ab+b
Phenotype class 2: a+a+bb, a+a bb
Phenotype class 2: aabb
We got 3 phenotypic classes.
Question 1:
Answer is 3
Question 2:
Most frequent F1 phenotype is ++ or a+b+
Question3:
Answer is (++) (a+) (+b) (ab)
As the two genes, a and b are 10 m.u apart. They produce 10 recombinants and 90 parental combinations, if it is kept in mind, the ++ will be most frequent and ab will be least frequent.
a+b+
a+b
ab+
ab
a+b
a+a+b+b
a+a+bb
a+ab+b
a+a bb
a+b
a+a+b+b
a+a+bb
a+ab+b
a+a bb
ab
a+a b+b
a+a bb
aab+b
aabb
ab
a+a b+b
a+a bb
aab+b
aabb