Farhanthestudent005
Member
- Joined
- May 22, 2021
- Messages
- 98
- Gender
- Male
- HSC
- 2022
Which one is it?
-
Finished your HSC? Check out our University Discussion, Non-School forums or help out next year's HSC students! -
YOU can help the next generation of students in the community! Share your trial papers and notes on our Notes & Resources page
Biology Question (1 Viewer)
- Thread starter Farhanthestudent005
- Start date
Which one is it?
Eagle Mum
Well-Known Member
- Joined
- Nov 9, 2020
- Messages
- 549
- Gender
- Female
- HSC
- N/A
Evolution by natural selection.
Malaria selected for the HbS trait because those who carried this trait were more likely to survive malaria infection and therefore pass on this trait to their offspring.
Note, of course, that when the carrier rate increases, there is an increased risk that two carriers will procreate and then there will be a 1 in 4 chance that each offspring will inherit HbS alleles from both parents which is lethal, but there’s a 2 in 4 chance their offspring will be carriers and further perpetuate the trait in their local population.
Malaria selected for the HbS trait because those who carried this trait were more likely to survive malaria infection and therefore pass on this trait to their offspring.
Note, of course, that when the carrier rate increases, there is an increased risk that two carriers will procreate and then there will be a 1 in 4 chance that each offspring will inherit HbS alleles from both parents which is lethal, but there’s a 2 in 4 chance their offspring will be carriers and further perpetuate the trait in their local population.