Final answer:
In a population of 500 people, 160 are homozygous dominant for tongue rolling and 90 cannot roll their tongue. The number of people who are heterozygous for tongue rolling is 250.
Step-by-step explanation:
In a population of 500 people, you are given that 160 are homozygous dominant for tongue rolling and 90 cannot roll their tongue. To find the number of people who are heterozygous for tongue rolling, we need to subtract the number of homozygous dominant and homozygous recessive individuals from the total population.Hence, the number of people who are heterozygous for tongue rolling would be 500 - 160 - 90 = 250.