BIOLOGY 1120 EXAM WITH
CORRECT ANSWERS
2025
Evolution ( correct answers ) the change in
heritable characteristics of a biological
population over successive generations
gene pool ( correct answers ) all the
alleles for all the loci present in a
population
Alleles ( correct answers ) alternate
forms of a gene
Genotypes ( correct answers ) the actual
allele combinations found in a
population.
The genotypic frequency ( correct
answers ) the proportion of a certain
genotype in a
population
phenotypic frequency ( correct answers ) the proportion of a
phenotype phenotype
particular ( correct answers ) the physical
in a population as
expression as
expressed of a
alleles
fraction or
decimal, with a value
between 0 and 1
How many alleles are in a population of 1000 for a trait? ( correct 200
0
answers ) Assumptions of Hardy-Weinberg ( correct
answers ) 1. No mutation
2.No migration
3.Random mating
4.No natural selection
5.Large population size
6.Random segregation of alleles
Hardy-Weinberg
e five processes equation ( correct answers () correct
that lead to microevolution p^2 +answers
2pq + )
q^2 = 1
•Nonrandom mating
, • Mutation
• Genetic drift
• Gene flow
• Natural
selection
Nonrandom mating increases the frequency of __________ ( correc
genotypes answers ) homozygous t
inbreeding depression( correct answers ) inbred
individuals have lower fitness than those not inbred
Assortative mating:( correct answers ) individuals select mates
by their phenotypes
Assortative mating changes frequencies only at which loci?
( correct answers ) those involved in mate choice
positive assortative mating ( correct answers ) selection of mates
with the same phenotype
negative assortative mating ( correct answers ) selection of mates
with opposite phenotypes
Mutations result from: ( correct answers ) • A change in nucleotide
base pairs of a
gene
• A rearrangement of genes on a chromosome that results in different
expressions
• A change in chromosome structure
Mutations is which cells die with the individual? ( correct answers )
somatic
In which cells can mutations be passed to offspring? ( correct answers )
germ line (reproductive)
Neutral variation ( correct answers ) differences in DNA sequence
that do not confer a selective advantage or disadvantage
deleterious mutation ( correct answers ) Genetic changes that are
harmful to an organism.
Genetic drift is ( correct answers ) random change in
the allele frequency in a small breeding population.
Genetic drift (decreases, increases)
variation in a population ( correct
answers ) decreases
CORRECT ANSWERS
2025
Evolution ( correct answers ) the change in
heritable characteristics of a biological
population over successive generations
gene pool ( correct answers ) all the
alleles for all the loci present in a
population
Alleles ( correct answers ) alternate
forms of a gene
Genotypes ( correct answers ) the actual
allele combinations found in a
population.
The genotypic frequency ( correct
answers ) the proportion of a certain
genotype in a
population
phenotypic frequency ( correct answers ) the proportion of a
phenotype phenotype
particular ( correct answers ) the physical
in a population as
expression as
expressed of a
alleles
fraction or
decimal, with a value
between 0 and 1
How many alleles are in a population of 1000 for a trait? ( correct 200
0
answers ) Assumptions of Hardy-Weinberg ( correct
answers ) 1. No mutation
2.No migration
3.Random mating
4.No natural selection
5.Large population size
6.Random segregation of alleles
Hardy-Weinberg
e five processes equation ( correct answers () correct
that lead to microevolution p^2 +answers
2pq + )
q^2 = 1
•Nonrandom mating
, • Mutation
• Genetic drift
• Gene flow
• Natural
selection
Nonrandom mating increases the frequency of __________ ( correc
genotypes answers ) homozygous t
inbreeding depression( correct answers ) inbred
individuals have lower fitness than those not inbred
Assortative mating:( correct answers ) individuals select mates
by their phenotypes
Assortative mating changes frequencies only at which loci?
( correct answers ) those involved in mate choice
positive assortative mating ( correct answers ) selection of mates
with the same phenotype
negative assortative mating ( correct answers ) selection of mates
with opposite phenotypes
Mutations result from: ( correct answers ) • A change in nucleotide
base pairs of a
gene
• A rearrangement of genes on a chromosome that results in different
expressions
• A change in chromosome structure
Mutations is which cells die with the individual? ( correct answers )
somatic
In which cells can mutations be passed to offspring? ( correct answers )
germ line (reproductive)
Neutral variation ( correct answers ) differences in DNA sequence
that do not confer a selective advantage or disadvantage
deleterious mutation ( correct answers ) Genetic changes that are
harmful to an organism.
Genetic drift is ( correct answers ) random change in
the allele frequency in a small breeding population.
Genetic drift (decreases, increases)
variation in a population ( correct
answers ) decreases
