Answer:
Frequency of allele S is p 
Frequency of allele C is q 
The population is not in Hardy-Weinberg equilibrium
Explanation:
Given -
Number of individuals with straight hair 
Number of individuals with curly hair 
Number of individuals with Wavy hair 
Let "p" represents the frequency for allele for straight hair and "q" represents the frequency for allele for curly hair
represents the frequency of genotype "SS"

represents the frequency of genotype "CC"

represents the frequency of genotype "SC"

Frequency of allele S is p

Frequency of allele C is q
tex]= \sqrt{0.444} \\= 0.666[/tex]
For being in Hardy Weinberg's equation-

Substituting the values in above equation, we get -

hence, the population is not in Hardy-Weinberg equilibrium