21.1

Question 1

evolution

Answer 1

defined as change in populations of organisms over time
more specifically: change in allele frequencies in populations over time
*individuals do not evolve

Question 2

genetic variation

Answer 2

presence of different alleles of genes in population
alleles are different versions of the same gene

Question 3

variation exists at many levels

Answer 3

can be studied at different levels: morphology, genes, proteins, genomes

Question 4

an individuals genotype contributes to its phenotype

Answer 4

genotype: genetic constitution/make-up of an individual
phenotype-the apparent characteristics of an individual