A zombie apocalypse wipes out almost the entire human species before the zombie

Question

A zombie apocalypse wipes out almost the entire human species before the zombie threat is eliminated. It appears that only a group of 100 people who were at a family reunion on an uninhabited island survived. They returned to the mainland completely unaware of what had happened to everyone. Answer the following questions regarding the few survivors that now begin to rebuild the human population.

Certain traits will have been lost from the gene pool forever. Some may be obvious, like people with red hair and double jointed thumbs. Others will be less obvious, like the ability to process cholesterol or being allergic to peanuts.

a.) Which of the following best describes the mechanism of microevolution that has altered the human gene pool? Explain.

b.) Despite an abundance of habitat, why will it be difficult for the human species to recover in numbers?

c.) A straggler with green eyes stumbles into the last remaining human outpost. The green eye trait did not exist in the outpost before her arrival, but it does now. What is the name of this mechanism of evolution? Explain.

Explanation / Answer

a.population bottle necking has occurred as all the humans are killed by zombies on mainland except 100 humans in the island.when these people comes to mainland they become the founderers to built up a new population causing a founderers effect

b.despite of the abundance of habitat the humans will face problem to recover in numbers as they are not all adapted to all type of habitats as a whole.

c.here genetic drift has occurred as the allele frequencies will change ultimately leading to evolution

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