Three genes with recessive mutant phenotypes are located on the same chromosome in maize: short stem...

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Biology

Three genes with recessive mutant phenotypes are located on thesame chromosome in maize: short stem (ss), purple aleurone(pr), and knotted leaf (kn). A plant with allthree mutant phenotypes is crossed with a true-breeding, wild-typeplant. Resulting F1 plants are then backcrossed to the parentalmutant line to produce the following progeny:  (7 points)

Short       Purple     Knotted      Number
ss                      +                kn                  2342
+                       pr               +                   2297
ss                      pr               kn                  4095
+                       +                +                   3963
+                       +                kn                  979
ss                      pr               +                   992
ss                      +                +                   77
+                       pr               kn                  75
        
         A.   Howmany non-recombinant progeny were identified?
         B.   Howmany of the F2 plants contained a crossover between the short stemand knotted leaf genes?
         C.  Draw a chromosome map with the correct distances (rounded to onedecimal point) noted                                         between adjacent pairs ofgenes.
         D.  What is the gene order and arrangement of alleles for the P and F1plants used in these crosses?

Answer & Explanation Solved by verified expert
4.0 Ratings (780 Votes)
A Nonrecombinant progeny 40953963 8058 B Short stem and knotted leaf gene progeny 6437 ss kn2342 ss pr kn4095 Tottal6437 C pr323cMss143cMkn D pr ss kn pr ss kn x P1 pr ss kn F1 Explanation Hint Always recombinant genotypes are smaller than the    See Answer
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