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Transcript
Name Class Date Chapter Vocabulary Review For Questions 1–8, complete each statement by writing the correct word or words. 1. In a small population, a random change in allele frequency is called . 2. When birds cannot interbreed because they have different mating songs, they are separated by isolation. 3. A situation in which allele frequencies change as a result of the migration of a small subgroup of a population is known as the . 4. Two related species that live in the same area but mate during different seasons are separated by isolation. 5. A(n) is a trait controlled by only one gene. 6. The is a change in allele frequency following a dramatic reduction in the size of a population. 7. __________________ is the number of times an allele occurs in a gene pool, compared to the total number of alleles in that pool for the same gene. For Questions 8–16, write True if the statement is true. If the statement is false, change the underlined word or words to make the statement true. 8. All of the genes in a population make up the allele frequency of the population. 9. Traits controlled by two or more genes are polygenic traits. 10. Reproductive isolation occurs when members of two populations do not interbreed and produce fertile offspring. 11. The separation of two populations by barriers such as rivers or mountains results in temporal isolation. 12. The Hardy-Weinberg principle states that allele frequencies in a population should remain constant unless one or more factors cause those frequencies to change. 13. Genetic drift is the formation of new species. 14. The founder effect occurs when the allele frequencies in a population remain constant. 15. For polygenic traits, when individuals near the center of the bell curve have higher fitness than individuals at either end, disruptive selection takes place. 16. When researchers use a molecular clock, they compare stretches of DNA to mark the passage of evolutionary time. 282