BIOL 1010 Unit 6 Exam Questions And
All Correct Answers 2025-2026
Updated.
0.0311 - Answer An autosomal recessive disease is found in 1 out of every 4000 people. If
the population is in Hardy Weinberg Equilibrium, what percentage of the population is a carrier
(Aa) for the disease?
0.03; 0.97 - Answer An autosomal dominant disease is found in 5% of the population
(remember, this is where the allele responsible for the disease is dominant). (Hint: Think about
which genotypes will have the disease if the disease is dominant; then, find out how many
people are 'normal'). Assuming the population is in Hardy Weinberg equilibrium,
What is the frequency of the dominant allele?
What is the frequency of the recessive allele?
0.35; 0.12 - Answer Brown hair is dominant to white hair in rats. 7 out of 12 rats have brown
hair. The rest have white. What is the brown hair allele frequency in the population if it is in
HardydWeinberg Equilibrium?
Approximately what percentage of mice would be homozygous dominant?
0.4; 0.6; It would stay the same - Answer In a biology class, 64% of the students were able to
roll their tongues. Assume that the ability to tongue roll is influenced by a dominant allele (T).
Assuming our classroom is a good representation of our overall population and that our
population is in Hardy-Weinberg equilibrium with respect to this trait
What is the frequency of the tongue roller allele (T) in this class?
What is the frequency of the non-tongue roller allele (t) in this class?
What do you expect the frequency of tongue rolling to be in the next generation?
YY = .04, Yy = .32, yy = .64; Yellow = .36, Green = .64 - Answer There are two alleles for corn
kernel color: Yellow and Green. Yellow (Y) is dominant to green (y). Let's say that the frequency
of the yellow allele, p = .2 and the frequency of the green allele, q = .8.
If the population is in Hardy Weinberg equilibrium, what is the expected genotype frequencies
in the next generation?
What are the expected phenotype frequencies in the next generation?
0.02; 0.04 - Answer Cystic fibrosis (CF) is a disabling and often fatal disease inherited as an
autosomal recessive characteristic. CF affects cell membrane function and as a consequence
, causes problems with the glands that produce mucus, digestive enzymes and sweat. Affected
individuals often have digestive, respiratory, and reproductive problems. CF occurs in about 1 of
every 2000 births in the US white population.
From this data, what would you estimate to be the proportion of the CF allele in the US white
population given that we are in Hardyd Weinberg equilibrium?
What is the frequency of heterozygous carriers of the CF allele who are most often parents of
children with CF?
0.46 - Answer In a hypothetical bug population in Hardy Weinberg equilibrium, 58% of the
bugs are black and 42% of the bugs are white. Considering that black is dominant to white, what
percentage of the bugs are heterozygous?
No Mutation - Answer No new alleles are generated by mutation, nor are genes duplicated
or deleted
Random Mating - Answer Organisms mate randomly with each other with no preference for
particular genotypes.
No gene flow - Answer Neither individuals not their gametes enter or exit the population
Very Large Population Size - Answer The population should be effectively infinite in size
No natural selection - Answer All alleles confer equal fitness (make organisms equally likely
to survive and reproduce).
Bottleneck - Answer Is a sharp reduction in the size of the population due to environmental
events (earthquakes, floods, fires, etc. ) or human activities (poaching, habitat loss, etc.)
Founders Effect - Answer The loss of genetic variation that occurs when a new population is
established by a very small number of individuals from a larger population
morphological species concept - Answer characterizes a species by body shape and other
structural features
biological species concept - Answer Species is a group of populations whose members have
the potential to produce fertile offspring.
Prediction - Answer In science, a possible outcome of a scientific test based on logical
reasoning about a particular scientific idea (i.e., what we would expect to observe is a particular
idea were true or false).
All Correct Answers 2025-2026
Updated.
0.0311 - Answer An autosomal recessive disease is found in 1 out of every 4000 people. If
the population is in Hardy Weinberg Equilibrium, what percentage of the population is a carrier
(Aa) for the disease?
0.03; 0.97 - Answer An autosomal dominant disease is found in 5% of the population
(remember, this is where the allele responsible for the disease is dominant). (Hint: Think about
which genotypes will have the disease if the disease is dominant; then, find out how many
people are 'normal'). Assuming the population is in Hardy Weinberg equilibrium,
What is the frequency of the dominant allele?
What is the frequency of the recessive allele?
0.35; 0.12 - Answer Brown hair is dominant to white hair in rats. 7 out of 12 rats have brown
hair. The rest have white. What is the brown hair allele frequency in the population if it is in
HardydWeinberg Equilibrium?
Approximately what percentage of mice would be homozygous dominant?
0.4; 0.6; It would stay the same - Answer In a biology class, 64% of the students were able to
roll their tongues. Assume that the ability to tongue roll is influenced by a dominant allele (T).
Assuming our classroom is a good representation of our overall population and that our
population is in Hardy-Weinberg equilibrium with respect to this trait
What is the frequency of the tongue roller allele (T) in this class?
What is the frequency of the non-tongue roller allele (t) in this class?
What do you expect the frequency of tongue rolling to be in the next generation?
YY = .04, Yy = .32, yy = .64; Yellow = .36, Green = .64 - Answer There are two alleles for corn
kernel color: Yellow and Green. Yellow (Y) is dominant to green (y). Let's say that the frequency
of the yellow allele, p = .2 and the frequency of the green allele, q = .8.
If the population is in Hardy Weinberg equilibrium, what is the expected genotype frequencies
in the next generation?
What are the expected phenotype frequencies in the next generation?
0.02; 0.04 - Answer Cystic fibrosis (CF) is a disabling and often fatal disease inherited as an
autosomal recessive characteristic. CF affects cell membrane function and as a consequence
, causes problems with the glands that produce mucus, digestive enzymes and sweat. Affected
individuals often have digestive, respiratory, and reproductive problems. CF occurs in about 1 of
every 2000 births in the US white population.
From this data, what would you estimate to be the proportion of the CF allele in the US white
population given that we are in Hardyd Weinberg equilibrium?
What is the frequency of heterozygous carriers of the CF allele who are most often parents of
children with CF?
0.46 - Answer In a hypothetical bug population in Hardy Weinberg equilibrium, 58% of the
bugs are black and 42% of the bugs are white. Considering that black is dominant to white, what
percentage of the bugs are heterozygous?
No Mutation - Answer No new alleles are generated by mutation, nor are genes duplicated
or deleted
Random Mating - Answer Organisms mate randomly with each other with no preference for
particular genotypes.
No gene flow - Answer Neither individuals not their gametes enter or exit the population
Very Large Population Size - Answer The population should be effectively infinite in size
No natural selection - Answer All alleles confer equal fitness (make organisms equally likely
to survive and reproduce).
Bottleneck - Answer Is a sharp reduction in the size of the population due to environmental
events (earthquakes, floods, fires, etc. ) or human activities (poaching, habitat loss, etc.)
Founders Effect - Answer The loss of genetic variation that occurs when a new population is
established by a very small number of individuals from a larger population
morphological species concept - Answer characterizes a species by body shape and other
structural features
biological species concept - Answer Species is a group of populations whose members have
the potential to produce fertile offspring.
Prediction - Answer In science, a possible outcome of a scientific test based on logical
reasoning about a particular scientific idea (i.e., what we would expect to observe is a particular
idea were true or false).
