If a female animal has a genotype of AAbb and is crossed with a male with aaBB a
ID: 53992 • Letter: I
Question
If a female animal has a genotype of AAbb and is crossed with a male with aaBB and the F1 is testcrossed, determine the percentage of the progeny from the testcross that will be aabb of the two genes if they are 10 map units apart?Please note I know that the testcross between female and male would produce a progeny of AaBb, Aabb, aaBb and aabb. A 25% for aabb or otherwords a 1:1:1:1 ratio. I just need help in solving for 10 map units apart. If a female animal has a genotype of AAbb and is crossed with a male with aaBB and the F1 is testcrossed, determine the percentage of the progeny from the testcross that will be aabb of the two genes if they are 10 map units apart?
Please note I know that the testcross between female and male would produce a progeny of AaBb, Aabb, aaBb and aabb. A 25% for aabb or otherwords a 1:1:1:1 ratio. I just need help in solving for 10 map units apart. If a female animal has a genotype of AAbb and is crossed with a male with aaBB and the F1 is testcrossed, determine the percentage of the progeny from the testcross that will be aabb of the two genes if they are 10 map units apart?
Please note I know that the testcross between female and male would produce a progeny of AaBb, Aabb, aaBb and aabb. A 25% for aabb or otherwords a 1:1:1:1 ratio. I just need help in solving for 10 map units apart. If a female animal has a genotype of AAbb and is crossed with a male with aaBB and the F1 is testcrossed, determine the percentage of the progeny from the testcross that will be aabb of the two genes if they are 10 map units apart?
Please note I know that the testcross between female and male would produce a progeny of AaBb, Aabb, aaBb and aabb. A 25% for aabb or otherwords a 1:1:1:1 ratio. I just need help in solving for 10 map units apart.
Please note I know that the testcross between female and male would produce a progeny of AaBb, Aabb, aaBb and aabb. A 25% for aabb or otherwords a 1:1:1:1 ratio. I just need help in solving for 10 map units apart.
Explanation / Answer
Based on the given data, by the normal crossing we can get 25% of all genotypes:
AaBb: 25 %
Aabb: 25 %
aaBb: 25 %
aabb: 25 %
However, if the recombination % is 10, then the % will vary:
S.no
Genotype
Type
Type of recombination
Number of progeny* (assumed)
% of genotype
1
AaBb
Parental genotype
No recombination
50
40%
2
Aabb
Recombinant
Recombinant between A and B
13
10%
3
aaBb
Recombinant
Recombinant between B and A
13
10%
4
aabb
Parental genotype
No recombination
50
40%
Total = 130
100%
Thus,
Thus, the ratio of the obtained genotypes is 1:1:1:1.
S.no
Genotype
Type
Type of recombination
Number of progeny* (assumed)
% of genotype
1
AaBb
Parental genotype
No recombination
50
40%
2
Aabb
Recombinant
Recombinant between A and B
13
10%
3
aaBb
Recombinant
Recombinant between B and A
13
10%
4
aabb
Parental genotype
No recombination
50
40%
Total = 130
100%
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