Multiple Choice
An earthquake hits a small island. All but a small group of closely related lizards are eliminated, and the survivors spread out over the island. This is an instance of __________.
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22. Evolution of Populations
Genetic Variation
Back22. Evolution of Populations
Genetic Variation
- Multiple ChoiceWhich type of selection maintains stable frequencies of two or more phenotypic forms in a population?1views
- Multiple Choice
Natural selection is able to work independently on different genes that are found on the same chromosome because of which process?
- Multiple ChoiceWhich statement below is true about sexual selection?1views
- Multiple ChoiceWhich type of mutation plays the most important role in increasing the number of genes in the gene pool?2views
- Multiple ChoiceWhich of the following mechanisms can form entirely new alleles?2views
- Multiple Choice
Which process ensures that alleles are always found in new combinations?
- Multiple Choice__________ and __________ generate variation, whereas __________ results in an adaptation to the environment.3views
- Multiple ChoiceSelection that acts over evolutionary time to preserve traits that increase an individual's ability to mate is known as __________.1views
- Multiple ChoiceStabilizing selection __________.2views
- Multiple Choice
Mutations that don’t impact the fitness of an allele can be called?
- Multiple Choice
Gene trees are evolutionary trees that show the evolutionary lineages of specific genes separate from organisms. Below is a gene tree for the genes that code for opsins in humans. Opsins are the light sensitive proteins in the eyes. Humans have four opsins that are active in visual perception: long-wavelength sensitive (LWS or red-sensitive), medium-wavelength sensitive (MWS or green sensitive), short-wavelength sensitive (SWS or blue sensitive), and rhodopsin (RH, not color sensitive). Which mutational process would be most likely to create a gene tree like this?
- Multiple ChoiceA population of 15 birds inhabits a fairly new island. Ten of the birds are dark brown, and five of them are light brown. By chance, two of the dark brown birds and three of the light brown birds die before producing any offspring. All of the birds in the next generation are dark brown. This change in phenotypic frequency can be attributed to __________.2views
- Multiple ChoiceWhich of the following is the best example of gene flow?2views
- Multiple ChoiceThe lethal genetic disorder Tay-Sachs disease occurs in individuals with two copies of a recessive allele of the responsible gene. Which of the following statements is true?2views