Answer:
(a) stabilizing selection
Explanation:
Sickle-cell anaemia is a recessive disorder caused by the presence of two recessive alleles "s", so the genotype is "ss". This disorder is characterized by sickle haemoglobin. In an area with malaria, heterozygous individuals "Ss" (with one dominant allele and one recessive allele) have an advantage. These individuals will have both normal and sickle haemoglobin. But pathogen that causes malaria affects only normal haemoglobin, so heterozygous individuals will have half of the haemoglobin resistant to the pathogen and those individuals are resistant to malaria.
Stabilizing selection favours heterozygotes Ss, disruptive selection favours dominant (SS) and recessive (ss) homozygotes, while directional selection favours dominant (SS) or recessive (ss) homozygotes. Since in this example, people with genotype Ss (heterozygotes) are at an advantage, then this is an example of stabilizing selection.
hope this helps:)
Answer:
If this is a true or false, the answer is true.
Answer:
25
Explanation:
of course!
These help the doctor because where there is inflammation there is heat and where ever there is inflammation, that is the part of the body that has the issue so symptoms should arise from that area.
