Question 1

Which type of aneuploidy is represented in gametes labeled B in the figure?

Accepted Answer

A)   nullisomy
B)   monosomy
C)   trisomy
D)   tetrasomyE) B) and C)
F) A) and C)

Question 2

Most strains of cultivated bananas were created by crossing plants within and between two diploid species: Musa acuminata (genome = AA)  and Musa balbisiana (genome = BB) . Some bananas have genome AAB, which is an example of which kind of polyploidy?

Accepted Answer

A)   allodiploid
B)   allotriploid
C)   autotriploid
D)   allotetraploid
E)   autotetraploidF) A) and B)
G) A) and C)

Question 3

How is colchicine, the chemical used in preparing karyotypes, useful for studying chromosomal mutations?

Accepted Answer

A)   Colchicine prevents cells from entering anaphase, stalling them in metaphase with condensed chromosomes.
B)   Colchicine induces chromosome condensation during interphase, which allows the visualization of interphase chromosomes.
C)   Colchicine causes chromosomal breakage, leading to inversions and translocations that can be observed with a microscope.
D)   Colchicine ruptures the cell membrane, allowing the spreading of cells on microscope slides.
E)   Colchicine causes cells to exit the cell cycle, making the chromosome easier to visualize.F) B) and E)
G) All of the above

Question 4

Which type of chromosome mutation INCREASES the amount of genetic material?

Accepted Answer

A)   deletion
B)   duplication
C)   inversion
D)   translocation
E)   transversionF) A) and D)
G) A) and C)

Question 5

The centromere is near one end, producing a long arm and a knob, in which type of chromosome?

Accepted Answer

A)   acrocentric
B)   metacentric
C)   paracentric
D)   submetacentric
E)   telocentricF) A) and E)
G) B) and E)

Question 6

Which of the following statements regarding the Drosophila Bar phenotype is NOT true?

Accepted Answer

A)   Unequal crossing over event may give a rise to the duplication of the Bar region.
B)   The trait is inherited as a complete dominant where both homozygous and heterozygous show similar phenotype.
C)   The more Bar segment copy the fly has, the more reduced the facets in the eyes get.
D)   The Bar phenotype reflects the genetic phenomenon called gene dosage effect.
E)   The balance of gene product is critical to cell function and normal development.F) None of the above
G) A) and D)

Question 7

What is responsible for primary Down syndrome?

Accepted Answer

A)   disomy
B)   inversion
C)   nondisjunction
D)   polyploidy
E)   translocationF) B) and D)
G) C) and D)

Question 8

A human embryo is produced by the fusion of two gametes that have a normal complement of sex chromosomes. This individual develops into an adult and is diagnosed with Turner syndrome. How can this be?

Accepted Answer

A)   An X chromosome was lost soon after fertilization, leading to a mosaic individual with a mixture of XX and XO cells.
B)   Nondisjunction produced a gamete that lacked any sex chromosome. This gamete was fertilized, which resulted in the individual with Turner syndrome.
C)   This individual is a gynandromorph with a mixture of both male and female characteristics.
D)   The embryo was exposed to colchicine soon after fertilization, which produced a polyploidy individual. Dosage compensation caused an imbalance between autosomal and X chromosome gene expression.
E)   A nonreciprocal translocation between the X chromosome and an autosome resulted in the loss of one of the X chromosomes.F) None of the above
G) All of the above

Question 9

A man has a condition where all of his gametes undergo nondisjunction of the sex chromosomes in meiosis I, but meiosis II proceeds normally. He mates with a woman who produces all normal gametes. What is the probability that the fertilized egg will develop into a child with Klinefelter syndrome (XXY) ? Assume that all gametes and zygotes are viable.

Accepted Answer

A)   1/8
B)   1/4
C)   1/3
D)   1/2
E)   0F) A) and E)
G) B) and E)

Question 10

Approximately _____ of the gametes produced by an individual heterozygous for a translocation will be nonviable.

Accepted Answer

A)   all
B)   half
C)   none
D)   a quarter
E)   an eighthF) B) and C)
G) A) and E)

Question 11

Which of the following is a form of aneuploidy in which four members of the same homologous pair are present?

Accepted Answer

A)   nullisomy
B)   monosomy
C)   disomy
D)   trisomy
E)   tetrasomyF) B) and D)
G) B) and C)

Question 12

Wild-type Arabidopsis has 5 chromosomes (2n = 10) . Trisomic plants are designated as "Tr" followed by the trisomic chromosome number-that is, Tr1 is trisomic for chromosome 1. Assuming that trisomy is fully viable and that all possible pairing configurations (including nonpairing)  are possible at meiosis, what proportion of the progeny from the cross wt × Tr1 will have a wild-type chromosomal complement?

Accepted Answer

A)   1/2
B)   1/3
C)   1/4
D)   1/9
E)   1/81F) A) and C)
G) C) and D)

Question 13

The complete set of chromosomes possessed by an organism is called a:

Accepted Answer

A)   polyploid.
B)   chromatin complement.
C)   karyotype.
D)   genotype.
E)   diploid.F) A) and C)
G) D) and E)

Question 14

An individual heterozygous for a reciprocal translocation possesses the following chromosomes: 
A B  ∙\bullet∙  C DE F G
A B  ∙\bullet∙  C DVW X
R S  ∙\bullet∙ T UE F G
R S  ∙\bullet∙  T UVW X
Will the products from alternate, adjacent-1, or adjacent-2 segregation be missing some genes?

Accepted Answer

A)   alternate segregation
B)   adjacent-1 segregation
C)   alternate and adjacent-1 segregation
D)   alternate and adjacent-2 segregation
E)   adjacent-1 and adjacent-2 segregation F) C) and E)
G) A) and C)

Question 15

Which type of polyploidy is synonymous with amphidiploid?

Accepted Answer

A)   allodiploid
B)   allotriploid
C)   autotriploid
D)   allotetraploid
E)   autotetraploidF) C) and D)
G) B) and E)

Question 16

Which type of chromosome mutation is responsible for familial Down syndrome?

Accepted Answer

A)   disomy
B)   inversion
C)   nondisjunction
D)   polyploidy
E)   translocationF) A) and D)
G) B) and C)

Question 17

A plant species has 2n = 18 chromosomes. How many chromosomes would you expect to find in a tetrasomic individual of this species?

Accepted Answer

A)   17
B)   19
C)   20
D)   22
E)   36F) A) and E)
G) D) and E)

Question 18

Down syndrome has, in some cases, been found to run in families. Explain the genetic basis for this inherited form of the condition.

Accepted Answer

Down syndrome is typically caused by the...

Question 19

A man has a condition where all of his gametes undergo nondisjunction of the sex chromosomes in meiosis I, but meiosis II proceeds normally. He mates with a woman who produces all normal gametes. What is the probability that the fertilized egg will develop into a child with Turner syndrome (XO) ? Assume that all gametes and zygotes are viable.

Accepted Answer

A)   1/8
B)   1/4
C)   1/3
D)   1/2
E)   0F) B) and C)
G) C) and E)

Question 20

Given an individual with a single recessive allele, explain how a deletion could result in the expression of the recessive phenotype.

Accepted Answer

When an individual has a single recessiv...

Exam 8: Chromosome Variation

A plant species has 2n = 18 chromosomes. How many chromosomes would you expect to find in a tetrasomic individual of this species?

Correct Answer
verified

The centromere is near one end, producing a long arm and a knob, in which type of chromosome?

Correct Answer
verified

Which type of chromosome mutation is responsible for familial Down syndrome?

Correct Answer
verified

Which type of aneuploidy is represented in gametes labeled B in the figure?

Correct Answer
verified

Given an individual with a single recessive allele, explain how a deletion could result in the expression of the recessive phenotype.

Correct Answer
Answered by ExamLex AI
When an individual has a single recessiv...
View Answer

An individual heterozygous for a reciprocal translocation possesses the following chromosomes: A B $\bullet$ C DE F G A B $\bullet$ C DVW X R S $\bullet$ T UE F G R S $\bullet$ T UVW X Will the products from alternate, adjacent-1, or adjacent-2 segregation be missing some genes?

Correct Answer
verified

The complete set of chromosomes possessed by an organism is called a:

Correct Answer
verified

Correct Answer
verified

How is colchicine, the chemical used in preparing karyotypes, useful for studying chromosomal mutations?

Correct Answer
verified

Down syndrome has, in some cases, been found to run in families. Explain the genetic basis for this inherited form of the condition.

Correct Answer
Answered by ExamLex AI
Down syndrome is typically caused by the...
View Answer

Approximately _____ of the gametes produced by an individual heterozygous for a translocation will be nonviable.

Correct Answer
verified

Most strains of cultivated bananas were created by crossing plants within and between two diploid species: Musa acuminata (genome = AA) and Musa balbisiana (genome = BB) . Some bananas have genome AAB, which is an example of which kind of polyploidy?

Correct Answer
verified

Which of the following statements regarding the Drosophila Bar phenotype is NOT true?

Correct Answer
verified

A human embryo is produced by the fusion of two gametes that have a normal complement of sex chromosomes. This individual develops into an adult and is diagnosed with Turner syndrome. How can this be?

Correct Answer
verified

What is responsible for primary Down syndrome?

Correct Answer
verified

Which type of polyploidy is synonymous with amphidiploid?

Correct Answer
verified

Which type of chromosome mutation INCREASES the amount of genetic material?

Correct Answer
verified

Which of the following is a form of aneuploidy in which four members of the same homologous pair are present?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Exam 8: Chromosome Variation

A plant species has 2n = 18 chromosomes. How many chromosomes would you expect to find in a tetrasomic individual of this species?

Correct AnswerverifiedShow Answer

The centromere is near one end, producing a long arm and a knob, in which type of chromosome?

Correct AnswerverifiedShow Answer

Which type of chromosome mutation is responsible for familial Down syndrome?

Correct AnswerverifiedShow Answer

Which type of aneuploidy is represented in gametes labeled B in the figure?

Correct AnswerverifiedShow Answer

Given an individual with a single recessive allele, explain how a deletion could result in the expression of the recessive phenotype.

Correct AnswerAnswered by ExamLex AIWhen an individual has a single recessiv...View AnswerShow Answer

An individual heterozygous for a reciprocal translocation possesses the following chromosomes: A B ∙\bullet∙ C DE F G A B ∙\bullet∙ C DVW X R S ∙\bullet∙ T UE F G R S ∙\bullet∙ T UVW X Will the products from alternate, adjacent-1, or adjacent-2 segregation be missing some genes?

Correct AnswerverifiedShow Answer

The complete set of chromosomes possessed by an organism is called a:

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

How is colchicine, the chemical used in preparing karyotypes, useful for studying chromosomal mutations?

Correct AnswerverifiedShow Answer

Down syndrome has, in some cases, been found to run in families. Explain the genetic basis for this inherited form of the condition.

Correct AnswerAnswered by ExamLex AIDown syndrome is typically caused by the...View AnswerShow Answer

Approximately _____ of the gametes produced by an individual heterozygous for a translocation will be nonviable.

Correct AnswerverifiedShow Answer

Most strains of cultivated bananas were created by crossing plants within and between two diploid species: Musa acuminata (genome = AA) and Musa balbisiana (genome = BB) . Some bananas have genome AAB, which is an example of which kind of polyploidy?

Correct AnswerverifiedShow Answer

Which of the following statements regarding the Drosophila Bar phenotype is NOT true?

Correct AnswerverifiedShow Answer

A human embryo is produced by the fusion of two gametes that have a normal complement of sex chromosomes. This individual develops into an adult and is diagnosed with Turner syndrome. How can this be?

Correct AnswerverifiedShow Answer

What is responsible for primary Down syndrome?

Correct AnswerverifiedShow Answer

Which type of polyploidy is synonymous with amphidiploid?

Correct AnswerverifiedShow Answer

Which type of chromosome mutation INCREASES the amount of genetic material?

Correct AnswerverifiedShow Answer

Which of the following is a form of aneuploidy in which four members of the same homologous pair are present?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
Answered by ExamLex AI
When an individual has a single recessiv...
View Answer

An individual heterozygous for a reciprocal translocation possesses the following chromosomes: A B $\bullet$ C DE F G A B $\bullet$ C DVW X R S $\bullet$ T UE F G R S $\bullet$ T UVW X Will the products from alternate, adjacent-1, or adjacent-2 segregation be missing some genes?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
Answered by ExamLex AI
Down syndrome is typically caused by the...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified