Imagine that two men and two women settle on an uninhabited island, no new settlers arrive, and nobody leaves the island for many generations. All four of the settlers have brown eyes, but one of the men carries a recessive gene for blue eyes
Eye color has no effect on fitness. If the percentage of blue-eyed individuals on the island increases from 0% to 25%, what is the probable cause?
A) Random mutation B) Natural selection C) Genetic drift D) Artificial selection
C
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In the adaptive immune response, effective immunity cannot be detected for several days after the first contact with the pathogen
Indicate whether the statement is true or false.
__________ are proteins, Y-shaped antigen receptors made only by __________ cells. Fill in the blank(s) with the appropriate word(s)
Which of the following is an example of mutualism?
a) a clown fish lives inside a sea anemone and is protected by it, while the anemone receives nothing from the clown fish b) a jaguar kills and consumes a gazelle c) a remora fish removes algae and parasites from a shark's skin and receives protection in return d) a wasp paralyzes a caterpillar and lays its egg inside it e) a female cuckoo lays its egg in the nest of a smaller bird, which then raises the cuckoo chick
Between 210,000 and 400,000 people die each year in the United States as a result of medical errors in hospitals. This number makes medical errors the ________ leading cause of death
Fill in the blank(s) with correct word