$28.$ The hemoglobin $3$ gene $($Hb$)$ has a common allele $($A$)$ of a SNP $($rs$334)$ that encodes the HbA form of $($adult hemoglobin and a rare allele $($T$)$ that encodes the sick$-$ling form of hemoglobin, Hb$.$ Among $571$ residents of a village in Nigeria, $440$ were A$/$A and $129$ were A$/$T$.$ and $2$ were T$/$T individuals were observed. Use the chi$-$square test to determine whether these observed geno$-$typic frequencies fit Hardy$-$Weinberg expectations.