The DNA has to replicate before mitosis and meiosis can occur.
Answer:
Dengue fever is a painful, debilitating mosquito-borne disease caused by any one of four closely related dengue viruses. caused When a mosquito bites a person infected with a dengue virus, Then, when the infected mosquito bites another person, the virus enters that person's bloodstream and causes an infection.
Answer:
Directional Selection
Explanation:
The type of natural selection that favors one of the extreme phenotypes over the intermediate and another extreme phenotype is called directional selection. Here, the extreme phenotype exhibits better survival and reproductive fitness over the other phenotypic ranges.
In the given example, the frequency of the heat-tolerant allele in microbes is shown to increase under the conditions of higher temperatures of the water of the springs in which they live.
When the temperature of spring water is increased, the frequency of the heat-tolerant allele is reduced and is increased again upon an increase in water temperature.
Since the natural selection favors the extreme phenotype (microbes with heat tolerance) when the spring water exhibits higher temperatures, it is directional selection.
C. <span>continue to divide even when they are tightly packed together.
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