Biology 1108 unit 1 exam Questions with
Correct Answers 2025-2026
Genetic variation CORRECT ANSWER differences in DNA sequences, caused by mutations
Locus, loci CORRECT ANSWER
specific, fixed position on a chromosome where a particular gene is located
Allele CORRECT ANSWER An alternative form of a gene
Genotype CORRECT ANSWER genetic makeup of an organism
Phenotype CORRECT ANSWER observable characteristics of an organism
Allele frequency CORRECT ANSWER # of copies of allele/ total # of alleles in population
P+q=1
Evolution CORRECT ANSWER
a change in the frequency of alleles or genotypes in a population over time
What is that change? CORRECT ANSWER
observable physical traits, relative size of genes (gel electrophoresis), and specific genetic co
de (DNA sequences)
Hardy-Weinberg equilibrium CORRECT ANSWER (no
evolution) No differential survival or reproductive success of
individuals
No migration
, No mutation
No small population
No mate choice
Genotype frequency CORRECT ANSWER p^2 + 2pq + q^2 = 1
Natural selection CORRECT ANSWER
change in an allele's frequency over time based on its impact on survival and reproduction
Fitness CORRECT ANSWER
measure of the extent to which the individual'e genotype is represented in the next genera
tion
Intersexual selection CORRECT ANSWER
females choose between male mates ~colors, attractions
Intrasexual selection CORRECT ANSWER within-sex competition for the female
Disruptive selection CORRECT ANSWER selects against the mean
Stabilizing selection CORRECT ANSWER selects against the extremes
Directional selection CORRECT ANSWER selects against one of the two extremes
Artificial selection CORRECT ANSWER
selection by a breeder rather than by natural selection
Correct Answers 2025-2026
Genetic variation CORRECT ANSWER differences in DNA sequences, caused by mutations
Locus, loci CORRECT ANSWER
specific, fixed position on a chromosome where a particular gene is located
Allele CORRECT ANSWER An alternative form of a gene
Genotype CORRECT ANSWER genetic makeup of an organism
Phenotype CORRECT ANSWER observable characteristics of an organism
Allele frequency CORRECT ANSWER # of copies of allele/ total # of alleles in population
P+q=1
Evolution CORRECT ANSWER
a change in the frequency of alleles or genotypes in a population over time
What is that change? CORRECT ANSWER
observable physical traits, relative size of genes (gel electrophoresis), and specific genetic co
de (DNA sequences)
Hardy-Weinberg equilibrium CORRECT ANSWER (no
evolution) No differential survival or reproductive success of
individuals
No migration
, No mutation
No small population
No mate choice
Genotype frequency CORRECT ANSWER p^2 + 2pq + q^2 = 1
Natural selection CORRECT ANSWER
change in an allele's frequency over time based on its impact on survival and reproduction
Fitness CORRECT ANSWER
measure of the extent to which the individual'e genotype is represented in the next genera
tion
Intersexual selection CORRECT ANSWER
females choose between male mates ~colors, attractions
Intrasexual selection CORRECT ANSWER within-sex competition for the female
Disruptive selection CORRECT ANSWER selects against the mean
Stabilizing selection CORRECT ANSWER selects against the extremes
Directional selection CORRECT ANSWER selects against one of the two extremes
Artificial selection CORRECT ANSWER
selection by a breeder rather than by natural selection
