RFLP pattern of ApaI VDR polymorphism (rs7975232) in 2% agarose gel showing homozygous wild AA genotype with a band of 744 bp (Lanes# 6, 9, 10, and 11), heterozygous Aa genotype with the bands 744, 527, and 217 bp (Lanes# 3, 4, 7, and 8), and homozygous mutant aa genotypes with the bands 527 and 217 bp (Lanes# 1, 2, and 5).