Question

A given chromosome contains three linked genes, B, T, and R that encode for the phenotypes:...

A given chromosome contains three linked genes, B, T, and R that encode for the phenotypes:

            B = Black, b = white

            T = Tall, t = short

            R = Round, r = square

To determine if the genes are linked a standard three-point testcross was done and the resulting offspring had the following phenotypes. Answer the based on this information.

                                                                                                                                   Alleles

52        Black, tall, round                                                                                 BTR

315      Black, short, square (Highest) Btr

75        Black, tall, square                                                                                           BTr

9          Black, short, round (Lowest)                                                                          BtR

48        White, short, square                                                                                        btr

321      White, tall, round (Highest) bTR

62        White, short, round                                                                                         btR

7          White, tall, square (Lowest)                                                                           bTr

Total: 889

What was the correct genotype of the heterozygous individual (IN THE RIGHT ORDER!)?     

  1. From the cross in question 3, what is the recombination frequency between T and R?
  2. From the cross in question 3, what is the recombination frequency between B and R?
  3. Use your answer from b and c to draw a linkage map of this chromosome.
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