Question 1

Which of the following prenatal tests is non-invasive?

Accepted Answer

A)  Amniocentesis
B)  Chorionic villi sampling
C)  Ultrasound
D)  Inserting a shunt into a fetus with water on the brainE) None of the above
F) A) and C)

Question 2

A heterozygote has identical alleles of a gene and a homozygote has different alleles.

Accepted Answer

A) True 
 B)False

Question 3

An individual who is homozygous dominant for a trait can be symbolized

Accepted Answer

A)  AA.
B)  Aa.
C)  aa.
D)  none of the above.E) All of the above
F) C) and D)

Question 4

Genes determine all of our characteristics.

Accepted Answer

A) True 
 B)False

Question 5

In incomplete dominance,the phenotype of a heterozygote is in between that of either homozygote.

Accepted Answer

A) True 
 B)False

Question 6

Identical alleles are said to be

Accepted Answer

A)  homozygous.
B)  heterozygous.
C)  recessive.
D)  dominant.E) None of the above
F) C) and D)

Question 7

Freckles are a phenotype and the allele combination that causes a clotting disorder is a genotype.

Accepted Answer

A) True 
 B)False

Question 8

Down syndrome is caused by

Accepted Answer

A)  nondisjunction or a translocation.
B)  the karyotype XXY.
C)  an extra Y chromosome.
D)  a missing autosome.E) None of the above
F) A) and B)

Question 9

Variable expressivity and pleiotropy can account for a disease that produces different intensities of symptoms or different symptoms among individuals.

Accepted Answer

A) True 
 B)False

Question 10

During amniocentesis

Accepted Answer

A)  a needle removes cells from the fetus.
B)  a piece of the placenta is snipped off and examined for abnormal cells.
C)  fetal fibroblasts in amniotic fluid are cultured and a karyotype constructed.
D)  blood is removed from a woman's arm and fetal cells isolated and their chromosomes karyotypeD.E) C) and D)
F) B) and D)

Question 11

An autosomal condition affects only males.

Accepted Answer

A) True 
 B)False

Question 12

A multifactorial trait is determined by many environmental factors,but not necessarily genetic influences.

Accepted Answer

A) True 
 B)False

Question 13

An example of a sex-influenced trait is

Accepted Answer

A)  baldness.
B)  hemophilia.
C)  colorblindness.
D)  hypertension.E) A) and B)
F) None of the above

Question 14

A recessive allele masks the effect of a dominant allele.

Accepted Answer

A) True 
 B)False

Question 15

Maternal serum marker tests detect metabolites in the fetus that may be associated with specific medical conditions.

Accepted Answer

A) True 
 B)False

Question 16

Antonio is colorblind.His partner Emilia is not colorblind nor is she a carrier (heterozygote) for colorblindness.The offspring of this couple would

Accepted Answer

A)  be sons with colorblindness and daughters with color vision.
B)  be colorblind daughters and sons with normal color vision.
C)  all be colorblind.
D)  all have normal color vision.E) All of the above
F) B) and D)

Question 17

The muscle disorder myotonic dystrophy can be caused by different genes,on different chromosomes.This means that the condition is genetically heterogeneic.

Accepted Answer

A) True 
 B)False

Question 18

A human cell that has 47 chromosomes is

Accepted Answer

A)  monosomic.
B)  euploid.
C)  polyploid.
D)  trisomic.E) B) and C)
F) None of the above

Question 19

In von Willebrand disease,which is either autosomal recessive or autosomal dominant,clotting time slows and the person bruises and bleeds easily.Not everyone who inherits the disease genotype actually develops the phenotype.Affected individuals have differing degrees of difficulty in clotting of blood.This condition is

Accepted Answer

A)  completely penetrant,variably expressive,and not genetically heterogeneic.
B)  incompletely penetrant,variably expressive,and genetically heterogeneic.
C)  completely penetrant,invariably expressive,and not genetically heterogeneiC.
D)  pleiotropic and genetically heterogeneicE) None of the above
F) A) and C)

Question 20

The expression of an inherited trait is the genotype and the DNA sequence is the phenotype.

Accepted Answer

A) True 
 B)False

Exam 24: Genetics and Genomics

A human cell that has 47 chromosomes is

Correct Answer
verified

Genes determine all of our characteristics.

Correct Answer
verified

Freckles are a phenotype and the allele combination that causes a clotting disorder is a genotype.

Correct Answer
verified

Identical alleles are said to be

Correct Answer
verified

An individual who is homozygous dominant for a trait can be symbolized

Correct Answer
verified

A recessive allele masks the effect of a dominant allele.

Correct Answer
verified

Down syndrome is caused by

Correct Answer
verified

Correct Answer
verified

Maternal serum marker tests detect metabolites in the fetus that may be associated with specific medical conditions.

Correct Answer
verified

Antonio is colorblind.His partner Emilia is not colorblind nor is she a carrier (heterozygote) for colorblindness.The offspring of this couple would

Correct Answer
verified

During amniocentesis

Correct Answer
verified

In incomplete dominance,the phenotype of a heterozygote is in between that of either homozygote.

Correct Answer
verified

An autosomal condition affects only males.

Correct Answer
verified

Variable expressivity and pleiotropy can account for a disease that produces different intensities of symptoms or different symptoms among individuals.

Correct Answer
verified

A heterozygote has identical alleles of a gene and a homozygote has different alleles.

Correct Answer
verified

A multifactorial trait is determined by many environmental factors,but not necessarily genetic influences.

Correct Answer
verified

An example of a sex-influenced trait is

Correct Answer
verified

The muscle disorder myotonic dystrophy can be caused by different genes,on different chromosomes.This means that the condition is genetically heterogeneic.

Correct Answer
verified

Which of the following prenatal tests is non-invasive?

Correct Answer
verified

The expression of an inherited trait is the genotype and the DNA sequence is the phenotype.

Correct Answer
verified

Exam 24: Genetics and Genomics

A human cell that has 47 chromosomes is

Correct AnswerverifiedShow Answer

Genes determine all of our characteristics.

Correct AnswerverifiedShow Answer

Freckles are a phenotype and the allele combination that causes a clotting disorder is a genotype.

Correct AnswerverifiedShow Answer

Identical alleles are said to be

Correct AnswerverifiedShow Answer

An individual who is homozygous dominant for a trait can be symbolized

Correct AnswerverifiedShow Answer

A recessive allele masks the effect of a dominant allele.

Correct AnswerverifiedShow Answer

Down syndrome is caused by

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Maternal serum marker tests detect metabolites in the fetus that may be associated with specific medical conditions.

Correct AnswerverifiedShow Answer

Antonio is colorblind.His partner Emilia is not colorblind nor is she a carrier (heterozygote) for colorblindness.The offspring of this couple would

Correct AnswerverifiedShow Answer

During amniocentesis

Correct AnswerverifiedShow Answer

In incomplete dominance,the phenotype of a heterozygote is in between that of either homozygote.

Correct AnswerverifiedShow Answer

An autosomal condition affects only males.

Correct AnswerverifiedShow Answer

Variable expressivity and pleiotropy can account for a disease that produces different intensities of symptoms or different symptoms among individuals.

Correct AnswerverifiedShow Answer

A heterozygote has identical alleles of a gene and a homozygote has different alleles.

Correct AnswerverifiedShow Answer

A multifactorial trait is determined by many environmental factors,but not necessarily genetic influences.

Correct AnswerverifiedShow Answer

An example of a sex-influenced trait is

Correct AnswerverifiedShow Answer

The muscle disorder myotonic dystrophy can be caused by different genes,on different chromosomes.This means that the condition is genetically heterogeneic.

Correct AnswerverifiedShow Answer

Which of the following prenatal tests is non-invasive?

Correct AnswerverifiedShow Answer

The expression of an inherited trait is the genotype and the DNA sequence is the phenotype.

Correct AnswerverifiedShow Answer

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