14. If a met thr Hfr strain is mated with an F strain be detected by plating the

Question

14. If a met thr Hfr strain is mated with an F strain be detected by plating the mixture on a) leucine b) threonine c) thiamine d) methionine e) minimal medium of genotype leu thi, thi recombinants can iO 15. A female Drosophila that is heterozygous for the recessive, sex-linked traits of forked bristles three traits. The phenotypic distribution of 1000 male testcross progeny is shown below: 74 wild e; 70 forked sable garnet; 44 forked; 50 sable garnet; 2 forked sable; 4 garnet; 368 sable; 388 orked garnet. What is the gene order? b) g--f--s c) s-g---f 0) tnely 's not enough information to tel f and g are linked e) there's not enough information to tell

Explanation / Answer

14. e.recombinant can detect by minimal media because it contains all the basic essential component which required for colony groth.

15. d. only f and g are linked,

here recombination frequency between f and g is

= recombinant/ total offspring* 100

=44+4/1000*100

=4.8 %

as like this recombination frequency between f and s is 41.2% and recombination frequency between g and s is 37.2% hence only f and g are closely linked. as the recombination frequency is low, the genes are closely linked.

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