Based on these data, what conclusions could the researchers make? a. Directional selection will push the entire population to have yellow shells. b. Yellow-brown snails are better adapted to their environment than the other colors because they match all types of backgrounds c. Stabilizing selection is occurring, creating a higher percentage of heterozygous individuals in each generation. d. There was higher mortality in yellow-brown snails than in brown or yellow snails.

Hominid brain size has increased over the last 3 million years. This is probably due to:   A. sexual selection   B. stabilizing selection   C. disruptive selection   D. directional selection   E. mutation.

There is a population of cats and 16% of the cats this population show a recessive trait. a. What is the frequency of the recessive allele? b.  What is the frequency of the dominant genotype?  c.  What is the frequency of cats with the heterozygous genotype?

1b.) Which is NOT commonly an effect of inbreeding in a population? a. an increase in the frequency of homozygous dominant individuals b. an increase in the frequency of homozygous recessive individuals c. an increase in the frequency of recessive genetic diseases d. better health and fertility of inbreds lines compared to lines that are not inbred.

You are studying a genetically modified mouse that produces electric blue fur, which is not a fur color observed in nature. You notice that females prefer males that have the blue fur when given a choice test for mates. This result supports which of the following models of sexual selection?   a. Sexual selection for indirect benefits   b. Sexual selection for direct benefits   c. Sexual selection for arbitrary traits   d. None of the above

Two related populations can mate with each other but don't because a mountain range separates them. What type of reproductive isolation does this describe?A. Temporal isolationB. Behavioral isolation C. Habitat isolation D. Mechanical isolation

Name Date 4. (5:17) Which of the following correctly describes a principle of natural selection? A. Variation in phenotype is what distinguishes one species from another. B. Individual members of a species are only able to pass down favorable traits. C. Populations produce more offspring than the environment can support. D. Only individuals that don't have unfavorable traits are able to reproduce. 5. (5:59) Which of the following is key to Darwin's theory? A. Individuals evolve over their lifetime as their environments change. B. Species evolve over generations as certain individuals reproduce. C. Humans evolve over their lifetime while animals evolve over generations. 6. (10:13) In your own words, explain the difference between directional selection, stabilizing selection, and disruptive selection. 7. (11:24) In your own words, explain how sexual selection also contributes to evolution. 8. (12:21) What is one question you still have about natural selection?

In nature, when a lone male lion encounters a pride (a group of lions with a male leader), the two males will often fight to become head of the pride. It has been documented that if the foreign lion wins the battle, he will usually kill the offspring of the weaker lion’s pride. This natural selection process best describes; Select one: a. Fitness within species  b. Bottleneck effect  c. Macroevolution  d. Microevolution  e. Speciation

According to "Homo naledi – New Questions on Human Evolution ", where was Homo naledi found and how many individuals were found there?   A.South Africa and 2 individuals B.Kenya and 2 individuals C.South Africa and 15 individuals D.Kenya and 15 individuals

A population of bats becomes isolated after colonizing an island, developing a high incidence of a negatively-impacting recessive genetic disorder not present in the original population they diverged from, or in the bats that originally colonized the island. What is the likeliest cause? a. Genetic drift b. Gene flow c. Founder effect d. Natural selection