Essential Genetics 6th Edition by Daniel Hartl

تمرين 4

A small portion of the genetic map of Neurospora crassa chromosome VI is illustrated here. The cys - 1 mutation blocks cysteine synthesis, and the pan - 2 mutation blocks pantothenic acid synthesis. Assuming complete chromosome interference, determine the expected frequencies of the following types of asci in a cross of cys-1 pan-2 × CYS-1 PAN-2.
(a) First-division segregation of cys-1 and first-division segregation of pan-2.
(b) First-division segregation of cys - 1 and second-division segregation of pan-2.
(c) Second-division segregation of cys-1 and first-division segregation of pan-2.
(d) Second-division segregation of cys-1 and second-division segregation of pan-2.
(e) Parental ditype, tetratype, and nonparental ditype tetrads.