Genetics Exam test quizzes and
answers graded A+
Which of the following is FALSE about genes?
- Genes come in variants known as alleles
- All genes are always active in all cells
- Genes are located on chromosomes - ANS✅✅All genes are always active in all cells
A trait that results from the interaction of the two alleles of a gene in an individual is called a:
- Single nucleotide polymorphism
- Genetic Variant
- Phenotype
- Genotype - ANS✅✅Phenotype
If a cell begins with 40 pairs of homologous chromosomes and goes through a process that produces
2 cells that also have 40 pairs of homologous chromosomes, then:
- Recombination just happened
- Mitosis just happened
- Meiosis just happened - ANS✅✅Mitosis just happened
A mutation in one allele of a gene disrupts the active site of the enzyme that the gene encodes and
thus inactivates the enzyme completely. This type of mutation is called a:
- Leaky mutation
- Null mutation
- Wild type mutation
- Silent mutation - ANS✅✅Null mutation
, In humans, most cells are somatic cells and diploid, while sex cells or gametes are haploid. This
means that gamete cells:
- Have two copies of each chromosome, one from each parent
- Have one copy of each chromosome, and each single copy could be from either parent
- Have one copy of each chromosome, and each copy is always from the same parent -
ANS✅✅Have one copy of each chromosome, and each single copy could be from either parent
Which of the following statements BEST describes a gene?
- An entire molecule of DNA
- A DNA sequence that resides on a specific chromosome
- A specific DNA sequence that makes up the introns
- A collection of amino acids within a protein - ANS✅✅A DNA sequence that resides on a specific
chromosome
If an individual has a genotype of A/a * B/b, what can you say FOR CERTAIN about the individual?
- The alleles are arranged in a trans configuration
- It is a monohybrid
- It displays the dominant phenotypes for genes A and B
- It displays the recessive A and B phenotypes - ANS✅✅It displays the dominant phenotypes for
genes A and B
If you are lactose intolerant (you cant consume dairy products) as an adult, you have a mutation in
your genome that inactivates the enzyme lactase. T/F?
- True
- False - ANS✅✅FALSE
Sex is determined in Heliconius butterflies by a similar X-Y mechanisms as in humans. The Bright- eye
mutant allele is X-linked and dominant for eye color in the butterfly. The mutant has yellow eyes
compared to the the wild-type form of the gene, which produces green eyes. If a yellow- eyed male
mates with a green-eyed female, what is true of the offspring?
answers graded A+
Which of the following is FALSE about genes?
- Genes come in variants known as alleles
- All genes are always active in all cells
- Genes are located on chromosomes - ANS✅✅All genes are always active in all cells
A trait that results from the interaction of the two alleles of a gene in an individual is called a:
- Single nucleotide polymorphism
- Genetic Variant
- Phenotype
- Genotype - ANS✅✅Phenotype
If a cell begins with 40 pairs of homologous chromosomes and goes through a process that produces
2 cells that also have 40 pairs of homologous chromosomes, then:
- Recombination just happened
- Mitosis just happened
- Meiosis just happened - ANS✅✅Mitosis just happened
A mutation in one allele of a gene disrupts the active site of the enzyme that the gene encodes and
thus inactivates the enzyme completely. This type of mutation is called a:
- Leaky mutation
- Null mutation
- Wild type mutation
- Silent mutation - ANS✅✅Null mutation
, In humans, most cells are somatic cells and diploid, while sex cells or gametes are haploid. This
means that gamete cells:
- Have two copies of each chromosome, one from each parent
- Have one copy of each chromosome, and each single copy could be from either parent
- Have one copy of each chromosome, and each copy is always from the same parent -
ANS✅✅Have one copy of each chromosome, and each single copy could be from either parent
Which of the following statements BEST describes a gene?
- An entire molecule of DNA
- A DNA sequence that resides on a specific chromosome
- A specific DNA sequence that makes up the introns
- A collection of amino acids within a protein - ANS✅✅A DNA sequence that resides on a specific
chromosome
If an individual has a genotype of A/a * B/b, what can you say FOR CERTAIN about the individual?
- The alleles are arranged in a trans configuration
- It is a monohybrid
- It displays the dominant phenotypes for genes A and B
- It displays the recessive A and B phenotypes - ANS✅✅It displays the dominant phenotypes for
genes A and B
If you are lactose intolerant (you cant consume dairy products) as an adult, you have a mutation in
your genome that inactivates the enzyme lactase. T/F?
- True
- False - ANS✅✅FALSE
Sex is determined in Heliconius butterflies by a similar X-Y mechanisms as in humans. The Bright- eye
mutant allele is X-linked and dominant for eye color in the butterfly. The mutant has yellow eyes
compared to the the wild-type form of the gene, which produces green eyes. If a yellow- eyed male
mates with a green-eyed female, what is true of the offspring?
