Other chromosomes have sequences as follows: 

(a) 1 2 5 6 7 8; 

(b) 1 2 3 4 4 5 6 7 8; 

(c) 1 2 3 4 5 8 7 6. 

What kind of chromosome change is present in each? Illustrate how these chromosomes would pair with a chromosome whose sequence is 1 2 3 4 5 6 7 8.