In rabbits, chocolate-colored fur (w⁺) is dominant to white fur (w), straight fur (c⁺) is dominant to curly fur (c), and long ear (s⁺) is dominant to short ear (s). The cross of a trihybrid rabbit with straight, chocolate-colored fur and long ears to a rabbit that has white, curly fur and short ears produces the following results:

  Phenotype                                Number 
White, short, straight                      13
Chocolate, long, straight               165
Chocolate, long, curly                    13
White, long, straight                       82
Chocolate, short, straight              436
Chocolate, short, curly                   79
White, short, curly                         162
White, long, curly                          450
                                                    1400

Determine the interference value for this cross.

A wild-type trihybrid soybean plant is crossed to a pure-breeding soybean plant with the recessive phenotypes pale leaf (l), oval seed (r), and short height (t). The results of the three-point test cross are shown below. Traits not listed are wild type.

Phenotype                  Number
Pale                               648
Pale, oval                        64
Pale, short                      10
Pale, oval, short            102
Oval                                  6
Oval, short                    618
Short                               84
Wild type                         98
                                    1630

Calculate the recombination frequencies between the adjacent genes.

A wild-type trihybrid soybean plant is crossed to a pure-breeding soybean plant with the recessive phenotypes pale leaf (l), oval seed (r), and short height (t). The results of the three-point test cross are shown below. Traits not listed are wild type.

Phenotype                  Number
Pale                               648
Pale, oval                        64
Pale, short                      10
Pale, oval, short            102
Oval                                  6
Oval, short                    618
Short                               84
Wild type                         98
                                    1630

What are the alleles on each homologous chromosome of the parental wild-type trihybrid soybean plant? Place the alleles in their correct gene order. Use L, R, and T to represent dominant alleles and l, r, and t for recessive alleles.

In rabbits, chocolate-colored fur (w⁺) is dominant to white fur (w), straight fur (c⁺) is dominant to curly fur (c), and long ear (s⁺) is dominant to short ear (s). The cross of a trihybrid rabbit with straight, chocolate-colored fur and long ears to a rabbit that has white, curly fur and short ears produces the following results:

  Phenotype                                Number 
White, short, straight                      13
Chocolate, long, straight               165
Chocolate, long, curly                    13
White, long, straight                       82
Chocolate, short, straight              436
Chocolate, short, curly                   79
White, short, curly                         162
White, long, curly                          450
                                                    1400

Calculate the recombination frequencies between each of the adjacent pairs of genes.

In rabbits, chocolate-colored fur (w⁺) is dominant to white fur (w), straight fur (c⁺) is dominant to curly fur (c), and long ear (s⁺) is dominant to short ear (s). The cross of a trihybrid rabbit with straight, chocolate-colored fur and long ears to a rabbit that has white, curly fur and short ears produces the following results:

  Phenotype                                Number 
White, short, straight                      13
Chocolate, long, straight               165
Chocolate, long, curly                    13
White, long, straight                       82
Chocolate, short, straight              436
Chocolate, short, curly                   79
White, short, curly                         162
White, long, curly                          450
                                                    1400

Determine the order of the genes on the chromosome, and identify the alleles that are present on each of the homologous chromosomes in the trihybrid rabbits.

The following progeny are obtained from a test cross of a trihybrid wild-type plant to a plant with the recessive phenotypes compound leaves (c), intercalary leaflets (i), and green fruits (g). (Traits not listed are wild type.) The test-cross progeny are as follows:

Phenotype                                                                           Number
Compound leaves                                                                  324
Compound leaves, intercalary leaflets                                     32
Compound leaves, green fruits                                                  5
Compound leaves, intercalary leaflets, green fruits                 51
Intercalary leaflets                                                                     3
Intercalary leaflets, green fruits                                              309
Green fruits                                                                              42
Wild type                                                                                  49
                                                                                               815

How many double-crossover progeny are expected among the test-cross progeny? Calculate the interference for this cross.

The following progeny are obtained from a test cross of a trihybrid wild-type plant to a plant with the recessive phenotypes compound leaves (c), intercalary leaflets (i), and green fruits (g). (Traits not listed are wild type.) The test-cross progeny are as follows:

Phenotype                                                                           Number
Compound leaves                                                                  324
Compound leaves, intercalary leaflets                                     32
Compound leaves, green fruits                                                  5
Compound leaves, intercalary leaflets, green fruits                 51
Intercalary leaflets                                                                     3
Intercalary leaflets, green fruits                                              309
Green fruits                                                                              42
Wild type                                                                                  49
                                                                                               815

Calculate the frequencies of recombination between the adjacent genes in the map.