A. Counting Alleles
Genotype		1/1		1/Δ32		Δ32/Δ32		Total
Number of individuals		79		20		1		100
Number of 1 alleles		158		20		0		178
Number of Δ32 alleles		0		20		2		22
Total number of alleles		158		40		2		200
Frequency of CCR5l in sample: 178/200 = 0.89 = 89%
Frequency of CCR5-Δ32 in sample: 22/200 = 0.11 = 11%
B. From Genotype Frequencies
Genotype		1/1		1/Δ32		Δ32/Δ32		Total
Number of individuals		79		20		1		100
Genotype frequency		79/100 = 0.79		20/100 = 0.20		1/100 = 0.01		1.00
Frequency of CCR51 in sample: 0.79 + (0.5)0.20 = 0.89
Frequency of CCR5-Δ32 in sample: (0.5)0.20 + 0.01 = 0.11