You are studying genes in yeast and find that the genes can be placed into four groups that tend to be inherited together. from this you can conclude that yeast:

The answer would be: Have four chromosomes

The traits of the yeast are determined by their genes. The genes will be split and inherited by the child in cell reproduction. The genes should come from their chromosomes. If the yeast could have 4 groups of genetic variance, then it should have at least four chromosomes to code it. 

Ais the answer for you

The answer to this would be choice b (diplod)