Determine if the statement is true. If it is not, rewrite the italicized part to make it true._x000d_
true_x000d_
1. Adaptations of species are determined by the genes contained in the DNA code. ___________________x000d_
2. When Charles Mendel developed the theory of natural selection in the 1800s, he did not include a_x000d_
Darwin_x000d_
genetic explanation. ___________________x000d_
3. Natural selection can act upon an individual’s genotype, the external expression of genes._x000d_
phenotype_x000d_
___________________x000d_
4. Natural selection operates on an individual over many generations. ___________________x000d_
5. The entire collection of genes among a population is its gene frequency. ___________________x000d_
6. If you know the phenotypes of all the organisms in a population, you can calculate the allelic frequency_x000d_
genotypes_x000d_
of the population. ___________________x000d_
7. A population in which frequency of alleles changes from generation to generation is said to be in_x000d_
populations gene pool_x000d_
genetic equilibrium. ___________________x000d_
does not change_x000d_
8. A population that is in genetic equilibrium is not evolving. ___________________x000d_
9. Any factor that affects phenotype can change allelic frequencies, thereby disrupting the genetic equilib-_x000d_
genes_x000d_
rium of populations. ___________________x000d_
10. Many migrations are caused by factors in the environment, such as radiation or chemicals, but others_x000d_
mutations_x000d_
happen by chance. ___________________x000d_
11. Mutations are important in evolution because they result in genetic changes in the gene pool._x000d_
true_x000d_
___________________x000d_
12. Genetic equilibrium is the alteration of allelic frequencies by chance processes. ____________________x000d_
small_x000d_
13. Genetic drift is more likely to occur in large populations. ___________________x000d_
natural selection_x000d_
14. The factor that causes the greatest change in gene pools is mutation. ___________________x000d_
15. The type of natural selection by which one of the extreme forms of a trait is favored is called_x000d_
true_x000d_
drift_x000d_
directional selection
