Biology, 18.04.2021 03:30, Jakethedog210
Sickle cell anemia is caused by a recessive allele. A person must have a recessive allele from each parent
to have the disease. A person who is heterozygous for sickle cell anemia does not have the disease. In
addition, this person is protected against malaria. Malaria is a disease that is common in countries in
Africa where people are more likely to have sickle cell anemia. A person who is heterozygous for sickle
cell anemia is somehow protected from malaria.
Assume that S represents the normal allele and that s represents the allele 2 points
for sickle cell anemia. What is the genotype for a person who is
heterozygous for sickle cell anemia?
Answers: 2
Biology, 21.06.2019 18:30, smelcher3900
The gene that causes sickle-cell disease is present in a higher percentage of residents of sub-saharan africa than among those of african descent living in the united states. even though this gene causes sickle-cell disease, it also provides some protection from malaria, a serious disease that is widespread in sub-saharan africa but absent in the united states. discuss an evolutionary process that could account for the different percentages of the sickle-cell gene among residents of the two regions.
Answers: 3
Biology, 22.06.2019 11:00, jimissac68
Which statement correctly describes other ways in which nebulae and stars are different? a. a star always has a higher density than a nebula. b. stars can form inside a nebula but a nebula can never be produced by any star. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star. reset submit
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Biology, 22.06.2019 15:30, qudoniselmore0
Ascientist is investigating the effects of salinity on fish development. he places fertilized fish eggs in an aquarium that contains low salinity and observes their development. what factor would improve experimental design the most? place the fish eggs in the open ocean because that is the natural habitat include another aquarium that has normal salinity to compare to the low salinity aquarium include an aquarium that replaces salt with sugar to confirm that the effects are specific to salt grow algae with the fish eggs in order to provide adequate nutrients to the developing embryos
Answers: 3
Sickle cell anemia is caused by a recessive allele. A person must have a recessive allele from each...
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