Try the combustibility of As, sb, and Cu.
"An Introduction to Chemical Science"
R.P. Williams
As in the cases of lethals 1 and 1a and lethals 3 and 3a, this lethal, lethal sb, was discovered from the fact that only a very few sons were produced, there being 82 daughters and only 3 sons.
"Sex-linked Inheritance in Drosophila"
Thomas Hunt Morgan Calvin B. Bridges