When two haploid gametes combine, a zygote with chromosomes forms.?

Answer;
When two haploid gametes combine, a zygote with 46 chromosomes forms. 

Explanation; 
Haploid gametes (Contains 23 chromosomes) are the results of meiosis which takes place in the germ line cells. Humans are diploid and have 46 chromosomes (two sets of each chromosomes). Human gametes contain only one set of chromosomes (23 chromosomes). 
During the process of fertilization the haploid gametes combine to form a diploid zygote (with 46 chromosomes).