thats prevelent in tropical areas. when a mosquito thats carrying the parasites bites someone, the parasites enter the persons bloodstream, and invades and lives in the persons red blood cells(rbcs). however, if a person has sickle cell anemia(ss), the presence of a parasite in a RBC is so stressful, it causes the RBC to sickle(crincle up), and when that happens, that kills the parasite before it can be multiply and spead to other RBCs. this, coincidentally, a person whos is ss is also "immune" to malaria. If a person is Ss and a malaria parasite tries to invade a RBC with abnormal hemoglobin, again, the RBC will sickle, killing the parasite before it has a chance to reproduce. If a parasite invades a RBC with normal hemoglobin, it will be able to live and multiply, but if its offspring invade other RBCs with abnormal hemoglobin, they too will be killed. Thus a person who is Ss is "resistant" thought not totally immune to malaria. If a person is SS and has all normal hemoglobin, the malaria parasites do just fine, invading RBCs growing and multiplying and invading more RBCs. Thus an SS person usually dies eventually from causes tied to the malaria.

A couple have seven children with genotypes SS Ss SS Ss ss SS Ss

SS- Susceptible to Malaria(normal hemoglobin)

Ss- resistant to malaria(sickle cell trait)

ss- immune to malaria(sickle cell anemia)

what does the genotype of both parents have to be?

complete punnett square

WHat is the probability that their next child will have normal hemoglobin?

what is the probablility that their next child will have sickle cell trait?

what is the probability that their next child will have sickle cell anemia?

what is the probability that their next child will survive malaria?

what about the punnett square????