Factors Affecting Genetic Variation

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Environmental factors can influence natural selection because they can increase or decrease
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Environmental factors can influence natural selection because they can increase or decrease
d the amount of genetic variation in a population.
An increase in food and a decrease in predators would most likely genetic variation in a population.
increase
In a few generations, this population of beetles changed.



Which is the most likely explanation for the change?
a The beetle population moved to a greener habitat.
In a population of seals, most of the seals have similar coloring. However, one seal has albinism. This seal is white and is almost completely blind. What is most likely the cause of this difference from the rest of the population?
c gene mutation
Which term best describes the difference in colors of the birds below?
c genetic variation
A scientist has been tracking and studying a population of deer in Yellowstone National Park. He surveys the population every six months. Usually, the population is thriving and has a gene pool with a wide variety of traits. But during one six-month period, an event occurred that affected the population, and when the scientist returned, the amount of genetic variation had decreased significantly. Which of the following is most likely the event that occurred to change the population?
b A population of wolves was introduced into Yellowstone National Park.
A group of students are walking in the park, and one of them takes a picture of a pollen grain that is being blown by the wind. What caption can the student use for this picture?
b gene flow at work
Changes in the gene pool can occur due to various mechanisms. From 1892 to 1954, millions of individuals emigrated (moved out) from countries across the Atlantic Ocean to the United States. Many of these individuals entered through Ellis Island, a federal immigration station in New York. Which mechanism affected the gene pool of the immigrants that entered the United States through Ellis Island?
b gene flow
Genetic drift in a population affects the gene pool in which of the following ways?
a decrease in genetic variation
Which environmental factor would likely lead to an increase in genetic variation in a population of squirrels?
b an increase in available food