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(a) Calculate the recombination frequencies between r2 and h and between r13 and h.

(b) Draw all possible linkage maps for these three genes.

E. coli cells are simultaneously infected with two strains of phage A. One strain has a mutant host range, is temperature sensitive, and produces clear plaques (genotype = h st c); another strain carries the wild-type alleles (genotype = h+ st+ c+). Progeny phage are collected from the lysed cells and are plated on bacteria. The genotypes of the progeny phage are:

Progeny phage genotype h+ c+ t+ h ct h+ c t h c+ t+ h+ c t+ h c+ t h+ c+ t h c t+

Number of plaques

0 0

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