Question

Please no handwriting and answer all three parts. Thank you.

Using the test cross data in the table below, answer the following questions. Be sure to answer all three parts! phenotype count PDB 756 PDB 59 PDB 414 PDb 21 pdB 23 pDb 417 Pdb 60 pdb 750 total 2500 1. Which genotypes are non-recombinants? (2 points) 2. Which gene is in the middle? (2 points) 3. Determine the genetic distances between each gene on the "outside of the group of three to the gene in the "middle." Show your work, and indicate your answer in centimorgans. (6 points)

Answer 1

Answer) pdb and PDB are the non recombinant types

( Note those combination which are highest in frequency are generally the parental - non recombinant types.)

Answer2) D gene is present in the middle

EXPLANATION

If we compare the parental tpe that PDB and pdb with the recombinant type which are lowest in frequency and are known as double cross over( D CO ) PdB and pDb we can observe the difference is only in D gene thus concluding that gene D gene would be present in middle

Answer 3). P...........35cM.........D........6.52cM.....B

Distance between D and P = no. Of frequency with single cross over( where D and P are present in different set) + double cross over / total progeny x 100

414+ 417+21+23/ 2500 x 100 = 35 centiMorgan

Distance between D and B = no. Of frequency with single cross over ( where D and B are present in different set ) + double cross over / total progeny

59+60+21+23/2500 x100 = 6.52 centiMorgan