Principles of Inheritance and Variation Question 94
94. Two dominant nonallelic genes are 50 map units apart. The linkage is
[1993]
(a) cis type
(b) trans type
(c) complete
(d) absent/ Incomplete
Show Answer
Answer : d
Hints & Solution
(d) Chromosome mapping is based on the fact that genes are linearly arranged on the chromosome and frequency of crossing over is directly proportional to the distance between two genes. Dominant genes show cis arrangement. At 50 map units cis is changed to trans & vice-versa hence no fixed linkage is present.
