Question 1

If a human female has 2 Barr bodies per cell, it is almost certain that

Accepted Answer

A)  her father had 1 Barr body per cell.
B)  her mother also had 2 Barr bodies per cell.
C)  she developed from a fertilized egg with 3 X chromosomes.
D)  she is genetically a male with female characteristics.E) A) and B)
F) A) and D)

Question 2

In 1910, Morgan did a series of experiments with the fruit fly Drosophila, an organism where females are XX and males are XY.When a mutant male fly with white eyes was crossed with a wild type female with red eyes, none of the F1 progeny had white eyes but 18% of the F2 progeny had white eyes.Unexpectedly, all of these white-eyed F2 flies were males.Based on these results, Morgan concluded that white eyes is caused by a recessive X-linked allele.Suppose Morgan had found that half of the F1 progeny had white eyes but all of these white-eyed F1 flies were females.In this case, a valid hypothesis would be

Accepted Answer

A)  White eyes is caused by a recessive Y-linked allele.
B)  White eyes is caused by a dominant Y-linked allele.
C)  White eyes is caused by a dominant X-linked allele.
D)  White eyes is caused by a dominant autosomal allele.E) A) and D)
F) C) and D)

Question 3

Why isn't mitochondrial DNA a unique identifier?

Accepted Answer

A)  Mitochondrial DNA is inherited through the paternal lineage.All offspring inherit their father's mitochondria, and therefore the same mitochondrial DNA.As a result, all family members that share a paternal lineage would have the same mitochondrial DNA.Mitochondrial DNA can therefore be used to confirm or eliminate a person's relationship within a paternal line, but cannot be used to identify a specific individual.
B)  Mitochondrial DNA is inherited through the maternal lineage.All offspring inherit their mother's mitochondria, and therefore the same mitochondrial DNA.As a result, all family members that share a maternal lineage would have the same mitochondrial DNA.Mitochondrial DNA can therefore be used to confirm or eliminate a person's relationship within a maternal line, but cannot be used to identify a specific individual.
C)  Mitochondrial DNA is inherited through the maternal lineage.All female offspring inherit their mother's mitochondria, and therefore the same mitochondrial DNA.As a result, all female family members that share a maternal lineage would have the same mitochondrial DNA.Mitochondrial DNA can therefore be used to confirm or eliminate a person's relationship within a maternal line, but cannot be used to identify a specific individual.D) A) and B)
E) A) and C)

Question 4

If an XY human had a genetic disorder that causes insensitivity to androgens, that person's genotype and phenotype would be

Accepted Answer

A)  XX, female.
B)  XX, male.
C)  XY, female.
D)  XY, male.E) A) and C)
F) None of the above

Question 5

Which of the following animals is a genetic male?

Accepted Answer

A)  bird ZW
B)  grasshopper XO
C)  honeybee diploid
D)  Drosophila XXYE) A) and B)
F) B) and C)

Question 6

In humans, the male has an X and a Y sex chromosome.The human female has two X chromosomes.In birds, the female has a Z and a W sex chromosome while the male has two Z chromosomes.Which of the following statements is accurate about which parent determines the gender of the offspring based on inheritace of the necessary sex chromosome?

Accepted Answer

A)  In humans and birds, the male determines the gender of all the offspring.
B)  In humans and birds, the female determines the gender of all the offspring.
C)  In humans, the male determines the gender of the offspring, and in birds the female determines the gender.
D)  In humans, the female determines the gender of the offspring, and in birds the male determines the gender.E) A) and B)
F) A) and C)

Question 7

Genetic maps are based on recombination frequencies.Because both odd and even numbers of crossovers can occur between any two gene loci, as the physical distance between two loci increases, the maximum recombination frequency levels off at 50%.However, suppose you discovered a species where only an even number of crossovers can occur between any two gene loci.In this case, as the physical distance between two loci increases, you would expect the maximum recombination frequency to

Accepted Answer

A)  remain at zero.
B)  increase with no limit.
C)  level off at 25%.
D)  level off at 75%.E) B) and C)
F) A) and B)

Question 8

Any genetic differences between individuals in a population are called

Accepted Answer

A)  markers.
B)  alleles.
C)  polymorphisms.
D)  SNPs.E) A) and D)
F) A) and C)

Question 9

The most common fatal genetic disorder of Caucasians is

Accepted Answer

A)  cholera.
B)  cystic fibrosis.
C)  hemophilia.
D)  sickle cell anemia.E) All of the above
F) B) and D)

Question 10

In some human populations, the proportion of individuals who are heterozygous for the sickle cell allele is much higher than would be expected by chance alone.Why?

Accepted Answer

A)  Individuals with two normal alleles have an advantage over heterozygous individuals.
B)  Individuals with two harmful alleles have an advantage over heterozygous individuals.
C)  Individuals with two harmful alleles have an advantage over individuals with two normal alleles.
D)  Heterozygous individuals have an advantage over individuals with two normal alleles.E) B) and D)
F) B) and C)

Exam 13: Chromosomes, Mapping, and the Meiosis-Inheritance Connection

Which of the following animals is a genetic male?

Correct Answer
verified

If a human female has 2 Barr bodies per cell, it is almost certain that

Correct Answer
verified

Correct Answer
verified

If an XY human had a genetic disorder that causes insensitivity to androgens, that person's genotype and phenotype would be

Correct Answer
verified

Correct Answer
verified

In some human populations, the proportion of individuals who are heterozygous for the sickle cell allele is much higher than would be expected by chance alone.Why?

Correct Answer
verified

Correct Answer
verified

Why isn't mitochondrial DNA a unique identifier?

Correct Answer
verified

Any genetic differences between individuals in a population are called

Correct Answer
verified

The most common fatal genetic disorder of Caucasians is

Correct Answer
verified

Exam 13: Chromosomes, Mapping, and the Meiosis-Inheritance Connection

Which of the following animals is a genetic male?

Correct AnswerverifiedShow Answer

If a human female has 2 Barr bodies per cell, it is almost certain that

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

If an XY human had a genetic disorder that causes insensitivity to androgens, that person's genotype and phenotype would be

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

In some human populations, the proportion of individuals who are heterozygous for the sickle cell allele is much higher than would be expected by chance alone.Why?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Why isn't mitochondrial DNA a unique identifier?

Correct AnswerverifiedShow Answer

Any genetic differences between individuals in a population are called

Correct AnswerverifiedShow Answer

The most common fatal genetic disorder of Caucasians is

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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