Answer:
alleles ( nothing but one of two or more different forms of a gene that arise by mutation and are found at the same place on a chromosome) that are responsible for tallness will decrease in number and thus, overall population of tall persons will decrease in number.
Explanation:
If all people over 6 feet tall do not have any children, this affect human population in a way that alleles ( nothing but one of two or more different forms of a gene that arise by mutation and are found at the same place on a chromosome) that are responsible for tallness will decrease in number and thus, overall population of tall persons will decrease in number.