Concepts of Genetics Chapter 5 Exam Questions and Correct Answers Latest Update 2024 (100% Pass)
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Concepts of Genetics Chapter 5
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Concepts Of Genetics Chapter 5
Concepts of Genetics Chapter 5 Exam Questions and Correct Answers Latest Update 2024 (100% Pass)
A mutation in which most of the protein coding sequence of the gene is removed is most likely to be which type of allele?
A) Lethal
B) Dominant
C) Loss of function
D) Sex-limited - Answers Loss...
Concepts of Genetics Chapter 5 Exam Questions and Correct Answers Latest Update 2024 (100% Pass)
A mutation in which most of the protein coding sequence of the gene is removed is most likely to be
which type of allele?
A) Lethal
B) Dominant
C) Loss of function
D) Sex-limited - Answers Loss of function
The phenomenon where half the "normal" level of functional protein is not enough to generate a
normal phenotype is called haploinsufficiency. Which of the following situations demonstrates
haploinsufficiency?
A) Persons with type AB blood display both A and B antigens on their red blood cells.
B) Heterozygous and homozygous flowers in Fig 5.2 are both purple.
C) "Small eye" in mice is caused by loss of one copy of the Pax6 gene.
D) A mutation in a protein causes it to become much more active than usual. - Answers "Small eye" in
mice is caused by loss of one copy of the Pax6 gene.
Which of the following statements about a lethal allele is NOT correct?
A) Lethal alleles are always recessive.
B) Lethal alleles may have a late age of onset.
C) Lethal alleles may be caused by mutations in essential genes.
D) Lethal alleles may affect one individual differently than another. - Answers Lethal alleles are always
recessive.
Sarah has chronic bronchitis and frequently ends up hospitalized with pneumonia. She has no family
history of cystic fibrosis, a serious recessive genetic disorder which affects the respiratory and digestive
tracts. She and her husband, Greg, have one child after undergoing fertility treatments to overcome
Greg's infertility. They are surprised when the child is diagnosed with cystic fibrosis and the genetic
counselor tells them that they each also have the condition, which causes their bronchitis and infertility.
Which of the following explanations would be a reasonable explanation of their situation?
A) There are several different alleles of cystic fibrosis, which cause differing forms of the disease.
B) Although the underlying disease is genetic, the severity of the disorder is influenced by
environmental variation.
, C) Cystic fibrosis displays variable expressivity.
D) All of the above.
E) None of the above. - Answers all of the above
A semilethal allele is an example of which of the following extensions of Mendelian genetics?
A) Incomplete dominance
B) Incomplete penetrance
C) Variable expressivity
D) Overdominance - Answers Incomplete penetrance
In a rare blood type referred to as the Bombay phenotype, individuals are unable to attach the A or B
antigens to their red blood cells. Individuals that are homozygous recessive for gene "H" have the
Bombay phenotype and their blood type is type "O" regardless of their ABO genotype. This is an
example of what extension of Mendelian inheritance?
A) Multiple alleles
B) Overdominance
C) Environmental influence
D) Epistasis - Answers Epistasis
Which of the following is the best example of overdominance?
A) Two lines of true breeding white parents produce purple flowered offspring.
B) Two lines of true breeding tomatoes that are susceptible to verticillium wilt (a fungal infection)
produce offspring that are resistant to verticillium wilt.
C) Two true breeding lines, one tall and one short, produce offspring of medium height.
D) Two true breeding lines, one tall and one short, produce all tall offspring. - Answers Two lines of true
breeding tomatoes that are susceptible to verticillium wilt (a fungal infection) produce offspring that are
resistant to verticillium wilt.
The recessive mutant allele that causes cystic fibrosis is much more frequent in Caucasians of eastern
European descent than in other populations. Some scientists believe heterozygotes must have had a
survival advantage during plagues such as cholera that occasionally swept through this population. What
concept does this illustrate?
A) Multiple alleles
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