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
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