Certain species of blind fish living in perpetual darkness in the ocean depths have evolved from ancestors that could see. Research indicates that the brain centers for vision in these fish is degenerating, whereas the brain centers controlling other senses are enlarging. What might be the MOST probable reason for the loss of vision in these fish?'
A.
exposure to mutagens that caused the loss of vision
B.
progressive selection of genetic variants in the population leading to blindness as an evolutionary adaptation
C.
infection by cave-dwelling microorganisms that has led to degeneration of the eyes
D.
extreme high pressure at the ocean depths causing a deterioration of vision
Answers: 3
Biology, 21.06.2019 16:30
Amutagen is 1: a living thing that has undergone a mutation. 2: an agent that causes a mutation in dna. 3: a mutation that has affected one gene. 4: a chemical that can poison living cells.
Answers: 1
Biology, 22.06.2019 02:20
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?
Answers: 3
Biology, 22.06.2019 09:30
Natural resources are any materials that humans obtain from the earth to meet our wants and needs.
Answers: 3
Biology, 22.06.2019 13:30
Stem cells found adult tissue such as in bone marrow brain muscle skin and liver are only capable of what
Answers: 1
Certain species of blind fish living in perpetual darkness in the ocean depths have evolved from anc...
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