PLEASE SHOW ALL WORK!! Genotype Number of offspring A,T,G 315 a,t,g 319 A,T,g 10
ID: 55740 • Letter: P
Question
PLEASE SHOW ALL WORK!!
Genotype
Number of offspring
A,T,G
315
a,t,g
319
A,T,g
100
A,t,G
70
A,t,g
19
a,T,G
15
a,t,G
96
a,T,g
66
a What are the parental chromosomes (i.e. no recombination has occurred)?
b What is the linear order of the three genes (i.e. which gene is in the middle)? How do you know this?
c Create a linear map of the genes A, T, and G. Include the centiMorgan (cM) distance between each gene.
Genotype
Number of offspring
A,T,G
315
a,t,g
319
A,T,g
100
A,t,G
70
A,t,g
19
a,T,G
15
a,t,G
96
a,T,g
66
Explanation / Answer
a) The parental chromosome is ATG and atg.
b) ATG - 315 ;ATg - 100 ; aTG - 15; aTg -66; AtG-70; Atg - 19; atG - 96 and atg - 319.
Single cross over class are aTG-15, aTg-66, AtG-70 and Atg-19.
The total recombinant offspring are (15+66+70+19) = 170. Total number of offspring - 1000. The recombinant between A and T is 170, Hence distance = 170/1000 X 100 = 17 LMU between A and T.
Recombinants between T and G ATg-100; atG -96, aTg-66 and AtG-70
Distance between t and g = 332/1000 x 100 = 33.2
Distance between t and g is 33.2 LMU
Distance between A and G is 33.2 + 19 = 50.2.
c, The genes are in the order of ATG, the distance between AT = 17 cM and TG = 33.2 cM and A and G = 50.2 cM.
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