Consequences of selection include nonrandom mating and genetic hitchhiking. However, the distribution of codon assignments in the genetic code is nonrandom. The significance of these nonrandom patterns of gene density is not well understood. In theory, the selection of what to pay attention to can be random or nonrandom. Crowdworkers are a nonrandom sample of the population. His charts do not adjust for the nonrandom distribution of whalers. Nonrandom X-inactivation leads to skewed X-inactivation. Nonrandom X-inactivation can be caused by chance or directed by genes.