Question
Biology Question on chromosome number
There are three genes a, b and c. The percentage of crossing over between a and b is 20%, b and c is 28% and a and c is 8%. What is the sequence of genes on chromosome
A
b, a, c
B
a, b, c
C
a, c, b
D
None
Answer
b, a, c
Explanation
Solution
Since the discovery of restriction endonuclease, genetic engineering has been able to manipulate DNA. Many hundred restriction enzymes are now known, each having a unique sequence requirement that determines where it can cut DNA. These were isolated from bacterial cells and are useful for molecular biologists. Therefore, using a restriction enzyme to digest DNA results in a specific collection of fragments that can be separated by electrophoresis and then examined.