They are composed of actin, troponin, tropomyosin, and myosin
Nondisjunction is the failure of one or more pairs of homologous chromosomes or sister chromatic.
The Hardy-Weinberg equation is:

where p generally represents the frequency of the homozygous dominant population.
The q usually represents the frequency of the homozygous recessive population, and the 2pq term represents the frequency of the heterozygous population.