Solutions For An Introduction to Genetic Analysis Chapter 4 Problem 25P

The genotypes can be assigned according to the characteristics in this way:

• Fat – F

• Long tail – L

• Flagella – Fl

When the most frequent class is compared with the least frequent class the gene sequence is F L Fl.

Parents: F L Fl/f l fl x f l fl/ f l fl

F1 progeny:

• 398 – fat, with tail, with flagella

• 370 – thin, no tail, no flagella

• 72 – fat, with tail, no flagella

• 67 – thin, no tail, with flagella

• 44 – thin, with tail, with flagella

• 35 – fat, no tail, no flagella

• 9 – thin, with tail, no flagella

• 5 – fat, no tail, with flagella

Total: 1000

The gene distances can be calculated in this way:

Between L – Fl:

Between F - L:

The map showing the three genes is: