In people sickle cell disease is codominant. When an individual is
heterozygous they have both normal and sickled cells. If an individual has
only recessive alleles, they have only sickle shaped cells. What is the
phenotypic ratio of offspring with two heterozygous parents? *

Humans are believed to have evolved in coastal regions in east africa. the region had an abundant supply of fish for early humanoids to eat. when scientists analyze the fads gene they see an interesting pattern. people whose families have lived in this area of east africa for generation show a high level of diversity in alleles for the fads gene. conversely, people whose families had migrated inland a moderate distance from sources of fish showed a much lower diversity for fads gene alleles. additionally, the fads alleles found in people whose family has lived inland for generation are almost all gene alleles which produce fads proteins with a high level of function and activity. how do anthropologists explain this?

If your blood becomes too concentrated with iona, what will happen to the red blood cells

_tissues respond quickly to outside stimuli a) epithelia b)nervous c)muscular d)muscular and nervous