another opoinion

hey please answer somone that realy help :
right or wrong question :
1.when homozygous has an advantage on Heterozygous  :
the most widespread ourcome is that the common allele (withe a frequency above 50%) willtake over  the population ?
2.the genteic variation fade away ?
.whenHeterozygous   has an advantage on  homozygous:
1 the effect of the allele on the fitness is dependent on the second allele that he appear with him inside the inividual ?
2.the 2 alleles will be be found after long time in a diffrent frequency that is expected in hardi winberd equilibrium ?
3.it wiil make a stedy polymorphismand the common of the diffrent alleles in equilibrium will be p=q=0.5 ?

tanks!!!!!!!!!!!