7F Quiz #1 Genetic Drift/Gene Flow

Common baboons live on the savanna in breeding groups called troops. While females tend to stay with the troop, younger or less dominant males may leave to join a neighboring troop. Which of these is a likely outcome of movement by young males?

• Gene flow occurs between populations.

• Allele frequencies suddenly change.

• Relative genotypic frequencies reach a constant state.

• Intermediate phenotypes increase in the species.

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Two populations of mice living in the same forest are separated by a large water-filled ditch. After a rainstorm, flooding brings several mice from one population to the other population. When the mice from the first population reproduce with members of the second population, which of the following will likely occur?

• All of the offspring will die as a result of reproductive mutations.

• The offspring will be forced to leave the second population.

• The offspring will be genetically identical to their parent from the first population.

• The offspring in the second population will have greater genetic variety.

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Lord Howe Island is a volcanic island in the Tasman Sea that is about 11 km long and 2.8 km wide. The island has two species of palm trees, Howea forsteriana and the more abundant Howea belmoreana. The two species do not interbreed even when they grow very close to each other. Which evolutionary process fails to occur?

• Genetic drift of Howea forsteriana

• Natural selection of adaptive traits in both species

• Gene flow between the two species

• Mutations in Howea belmoreana

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The concept of gene flow is demonstrated when a cow is driven off from its herd, joins another herd, and reproduces. When the cow contributes to the gene pool of the new herd, which of these most likely increases?

• natural selection
• genetic variation
• environmental fitness
• reproductive mutations

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Movement of individuals with different genes from one population to another is called ___________.

• genetic drift

• continental drift

• gene flow

• genetic variation

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What is the basis for all variation among organisms?

• Mutation
• Genetic Drift
• Migration
• Inbreeding

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If two species have a similar DNA sequence, we can conclude...

• that they share a recent common ancester

• that they are not related

• that they both carry out the same functions

• that they were/are alive at the same time

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The chart shows the embryos and adult forms of animals from different classification groups.  What do the embryos suggest about these three animals?

• The animals are not related.
• The animals share a common ancestor and are therefore related
• Fish are more closely related to humans than are chickens.
• Fish and chickens ar closely related, but humans are not related to either fish or chickens.

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According to the cladogram, which organisms are most closely related?

• C & D

• A & C

• B & D

• A & D

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Below is a table showing examples of organisms from different groups.
According to this information, the house cat is most closely related to which animal?

• Wolf
• Mockingbird
• Butterfly
• Lynx

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