Question

THIS information pertains to Questions 6-7: In corn, 3 genes (P. Su and Tls) are linked on a chromosome as shown below: Su Tls 12 m.u. | 18 m.u. At each gene, two alleles exist with the mutant allele recessive to the wild type allele. A true- breeding individual with mutant phenotype for gene P is crossed to a true-breeding individual with mutant phenotype for Su and Tls. pttx o su TIS 6. The Fl is test-crossed. Assuming no interference, with what frequency will plants mutant for all three genes appear in the test-cross progeny? a) 4.9% b) 6% c) 12% d) 12.5% e) none of the above 7. The F1 is allowed to self-fertilize. Assuming no interference, with what frequency will plants mutant for all three genes appear in the F22 a) 0.2% b) 4.2% c) 4.9% d) 9.8% e) none of the above

Answer 1

Question 6) option B, 6%

Question 7) option c, 4.9 %

Explanation of both these questions has been attached below. Hope this will help

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72 mu Tomu Recombination frequency o distane between gone. individal for mutant P indiviuel for me . Su and I po busy tits polo 34 Sy Tistis 784 fin progoney - guneltes IP 34 itir 34 o su Tirl ot - 84 to hr. Question Р I si P 24 by sig 15 His tot Parinted 5 Single was over betwen borel sy 3.60 betwen Su and I/5 Double Crodova distene between p and sy is 12 mu - Recombination frequery was be 127

both will be lis. each will be 6%. To su bs - 67 p su Tir 6.). in case of self fertilization of fi 34 Ls x sy . Tirllur Tirl 165 fingle cross over between b and su also include couble cross over. (Bicol d'uo solo between Suent suo b/w pand su x 120 xToi 14- achal s.c.o bethen bad su is. 12- 2.1 ? Grginen psut G.g.). psu gr , 4.94