In a diploid plant species, an F1 with the genotype Mm Rr Ss is test crossed to a pure breeding recessive plant with the genotype mm rr ss. The offspring genotypes are as follows:
|
Genotype |
Number |
|
Mm Rr Ss |
687 |
|
Mm Rr ss |
5 |
|
Mm rr Ss |
68 |
|
Mm rr ss |
196 |
|
mm Rr Ss |
185 |
|
mm Rr ss |
72 |
|
mm rr Ss |
8 |
|
mm rr ss |
679 |
|
Total |
1900 |
1. What is the interference value for this data set?
Interference value : A situation in which the occurrence of a cross over between any two nonsister chromatids can be shown to affect the probability of those chromatids being involved in other crossovers in the same meiosis.
Test cross : It is a cross between an organisms with unknown genotype and a recessive parent . It is used to determine whether the individual is homozygous or heterozygous for a trait .
If all of the offspring produced express the dominant trait , the individual in question is homozygous for the dominant allele.
Test cross ratio always comes 1:1:1:1
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