Determine if the statement is true. If it is not, rewrite the italicized part to make it true. true 1. Adaptations of species are determined by the genes contained in the DNA code. __________________ 2. When Charles Mendel developed the theory of natural selection in the 1800s, he did not include a Darwin genetic explanation. __________________ 3. Natural selection can act upon an individual’s genotype, the external expression of genes. phenotype __________________ 4. Natural selection operates on an individual over many generations. __________________ 5. The entire collection of genes among a population is its gene frequency. __________________ 6. If you know the phenotypes of all the organisms in a population, you can calculate the allelic frequency genotypes of the population. __________________ 7. A population in which frequency of alleles changes from generation to generation is said to be in populations gene pool genetic equilibrium. __________________ does not change 8. A population that is in genetic equilibrium is not evolving. __________________ 9. Any factor that affects phenotype can change allelic frequencies, thereby disrupting the genetic equilib- genes rium of populations. __________________ 10. Many migrations are caused by factors in the environment, such as radiation or chemicals, but others mutations happen by chance. __________________ 11. Mutations are important in evolution because they result in genetic changes in the gene pool. true __________________ 12. Genetic equilibrium is the alteration of allelic frequencies by chance processes. ___________________ small 13. Genetic drift is more likely to occur in large populations. __________________ natural selection 14. The factor that causes the greatest change in gene pools is mutation. __________________ 15. The type of natural selection by which one of the extreme forms of a trait is favored is called true drift directional selection