The allele responsible for sickle-cell anaemia first appe...
The allele responsible for sickle-cell anaemia first appeared in the tropical and subtropical regions of Asia, the Middle east and Africa. It entered the United States of America when individuals were forcibly brought over from Africa. In micro-evolutionary terms this is an example of
mutation
gene flow
genetic drift
natural selection
Correct answer is B
No explanation has been provided for this answer.
Which of the following statement is NOT true of symbiosis? ...
The diagrams above are part of the human lungs. Which of the parts is diagram Z taken from ...
If a healthy potted plant is continuously kept in dim light ...
Which of the natural resources are non-renewable? ...
Which of the following is associated with the dark stage of photosynthesis? ...
Which of the following best describes a marine habitat? ...
The organic component of the soil is labelled ...
Special modification which enable an organism to survive in its habitat is known as. ...