In the cross Hfr aro+ arg+ ery+ strs * F-aro- arg- erys strr, the markers are tr
ID: 57499 • Letter: I
Question
In the cross Hfr aro+ arg+ ery+ strs * F-aro- arg- erys strr, the markers are traseferres in the order given( with aro+ entering first) but the first three genes are very close together. Exconjugants are plated on a medium containing Str, Ery, Arg and Aro. the following resuls are obtained for 300 colonies isolated from these plates andtested for growth on media.
Ery252 strains grow
Ery+ Arg 253 strains grow
Ery+Aro 279 strains grow
Ery+Arg+Aro 300 strains grow
A) Draw up a list of the genotypes and indicate the number of individuals in each genotype
B) Calculate the recombination frequencies
C) calculated the ratio of the size of the arg-to-aro region of teh size of the ery-to-aro region.
Explanation / Answer
In the cross Hfr aro+ arg+ ery+ strs * F-aro- arg- erys strr, the markers are tr