Question

In an ornamental plant, silver-colored flowers (s) are recessive to blue-colored flowers (S), red leaves (r) are recessive to green leaves (R), and long stems (l) are recessive to short stems (L). All three genes involved are located on the same chromosome. Two true-breeding strains were crossed to produce an F1 plant. Then, this F1 plant was test-crossed to a plant with silver flowers, red leaves, and long stems, to produce the following progeny:

progeny phenotype	count of progeny
silver flowers, green leaves, short stem	29
silver flowers, red leaves, short stem	87
blue flowers, red leaves, short stem	394
silver flowers, red leaves, long stem	970
silver flowers, green leaves, long stem	423
blue flowers, green leaves, long stem	95
blue flowers, green leaves, short stem	975
blue flowers, red leaves, long stem	27
TOTAL	3000

Use the information in the table to answer the following questions.

For questions A through C, give your answer as a decimal number between 0 and 1, rounded to three decimal places with a leading zero (ex: 0.561).

A. What is the recombination frequency between the flower color (S) and leaf color (R) loci?

B. What is the recombination frequency between the leaf color (R) and stem length (L) loci?

C. What is the recombination frequency between the flower color (S) and stem length (L) loci?

Now, give your answer to part D as a whole number (ex: 50).

D. If the 3 loci were segregating independently of each other, how many progeny would be expected to have silver flowers, green leaves, and long stems?

Answer 1