can you please answer questions 35 and 36 please. both questions are based on th

Question

can you please answer questions 35 and 36 please. both questions are based on the diagram and I would really like to know how to do them. thank you.

Questions 34-36 refer to the fo Ear length in corn varies from 100 t 100 and 180 mm varieties were crossed, the El plants producea ears 40 znm in Length. In the F2 generation, the of-a-da- ange f sizes but only De andof 768 When true-breeding 72 roduced ears 768 were 100 were 180 34 How many gene pairs affec ear length? 35. How much does each additive allele contribute to ear length? a) 1 b) 2 c) 3 4 e) 5 a) 80 mm 10 mum c) 40 d) 20 mm e) 13.3 mm 36. A 160 mm ear would be produced by a plant with-_ additive alleles. a) 2 b) 3 c) 4 d) 56 2 60 69-6 1 g0

Explanation / Answer

ratio of F2 progeny expressing either extreme phenotype in quantitaive inheritance = 1/4n .......(1)

where n represents gene pair

extreme phenotype in this case is corn having ear length 100mm or 180mm

so its ratio is=3/768 = 1/256 = 1/44

now compare with equation (1)

you will find n=4

34) so option D is the answer

35) the difference between heights of true breeding =180-100 = 80mm

so this difference must be result from the presence of contributing alleles. The tall plants has 8 contributing allele (4 gene pair as found in problem 34).

so each dominant allele contributes an average of (80/8) = 10mm  

so option B is correct answer.

36) difference between height = 160-100 = 60mm

in problem 35 we found that each additive allele is contributing 10mm length.

so total number of additive allele for 60mm = 60/10 = 6

Hence option e is correct answer.

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