12 Jun XB 143 Which sets are considered recombinant
Question
Which sets are considered recombinant? For instance, between loci A and B, would I consider the A/B and a/b recombinant or the A/b and a/B recombinant?
Question 1(15 points)
You are tracking three loci in the fruit fly, locisA, B,andC, andwant to know whether the loci are linked and if so what their physical distances are from one another as well as the physical order they are in. To find out this information you perform a three-point testcross with a fly that is heterozygous for all three alleles. The progeny of this cross are:
Genotype
Number of individuals
a/aB/bC/c
389
A/ab/bc/c
410
a/ab/bC/c
39
A/aB/bc/c
44
a/ab/bc/c
77
A/aB/bC/c
83
a/aB/bc/c
6
A/ab/bC/c
5
TOTAL
1053
(a) What is the recombination frequency between loci A and B?
(b) What is the recombination frequency between loci B and C?
(c) What is the recombination frequency between loci A and C?
(d) Are these loci linked?
(e) Demonstrate the physical arrangement of the genes on the chromosome, i.e. the order of the genes on a chromsosome as well as their map distances.
(f)Write out the genotypes of the parents for this cross, indicating which alleles are linked with one another for each parent?
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