Please help! Thank you. 3) NATURAL SELECTION: HOW MIGHT MALARIA RESISTANCE HAVE BEEN SELECTED FOR IN A POPULATION OF HUMANS? Draw a model showing the relative frequency of the sickle-cell allele in a human population at three different time points: Time 0 (before selection by malaria), Time 1 (when this population comes into contact with malaria), and Time 2 (after many, many generations of contact with malaria). Use a pictorial representation for this purpose (like our in-class HIV drug resistance model), where a circle represents a human, two lines inside the circle represent a pair of homologous chromosomes, and an X represents the sickle-cell allele on a chromosome.

Views: 5,522 students