Question 1

An example of a sex-influenced trait is

Accepted Answer

A)   baldness.
B)   hemophilia.
C)   colorblindness.
D)   hypertension.

Question 2

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

Accepted Answer

A) True 
 B)False

Question 3

A human male is hemizygous for genes on the X chromosome because he has two copies of that chromosome.

Accepted Answer

A) True 
 B)False

Question 4

An inverted bell-shaped curve represents the distribution of phenotypes of a multifactorial trait in a population.

Accepted Answer

A) True 
 B)False

Question 5

An autosomal dominant condition in a family will disappear if in any generation no one inherits the disease.

Accepted Answer

A) True 
 B)False

Question 6

Gene expression profiling

Accepted Answer

A)   detects the mRNAs present in a particular cell type under particular conditions.
B)   detects the mutations that a person has inherited.
C)   is a chart of chromosomes in specific cell types.
D)   is a size-order chart of chromosomes.

Question 7

A multifactorial trait is determined by

Accepted Answer

A)   only environmental factors.
B)   only by genetic factors.
C)   neither genetic nor environmental factors.
D)   one or more genes and the environment.

Question 8

Polydactyly is an example of a trait that is both ___________ and variably expressive.

Accepted Answer

A)   incompletely penetrant
B)   pleiotropic
C)   multifactorial
D)   completely penetrant

Question 9

The phenotypes and genotypes that result from a cross of Aa and aa (A = normal pigmentation and a = albinism)  are

Accepted Answer

A)   phenotypes-all normal; genotypes-50% heterozygous and 50% homozygous recessive.
B)   phenotypes-all albino; genotypes-all homozygous recessive.
C)   phenotypes-50% normal and 50% albino; genotypes-50% heterozygous and 50% homozygous recessive.
D)   phenotypes-all albino; genotypes-50% heterozygous and 50% homozygous recessive.

Question 10

The field of genetics deals only with disease.

Accepted Answer

A) True 
 B)False

Question 11

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 brain

Question 12

Different alleles of the same gene are said to be

Accepted Answer

A)   homozygous.
B)   heterozygous.
C)   recessive.
D)   dominant.

Question 13

The genotypes and phenotypes that result from a cross of AA and Aa (A = normal pigmentation and a = albinism)  are

Accepted Answer

A)   phenotypes - all normal; genotypes - 50% homozygous dominant and 50% heterozygous.
B)   phenotypes - 50% normal and 50% albino; genotypes - all heterozygous.
C)   phenotypes - 75% norma and 25% albino; genotypes - 75% heterozygous and 25% homozygous.
D)   phenotypes - all albino; genotypes - 50% heterozygous and 50% homozygous recessive.

Question 14

A recessive allele masks the effect of a dominant allele.

Accepted Answer

A) True 
 B)False

Question 15

The two general types of chromosomes are

Accepted Answer

A)   autosomes and allosomes.
B)   sex chromosomes and allosomes.
C)   sex chromosomes and autosomes.
D)   X and Y chromosomes.

Question 16

How alike are our genomes?

Accepted Answer

A)   About 10%
B)   About 25%
C)   About 75%
D)   Nearly 100%

Question 17

Amniocentesis provides an image of a developing fetus.

Accepted Answer

A) True 
 B)False

Question 18

The processes that pass genetic information from generation to generation are

Accepted Answer

A)   mitosis and fertilization.
B)   meiosis and fertilization.
C)   mitosis and meiosis.
D)   interactions of DNA and the environment.

Question 19

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.

Question 20

Genetic information passes from protein to RNA to DNA.

Accepted Answer

A) True 
 B)False

Exam 24: Genetics and Genomics

A multifactorial trait is determined by

Correct AnswerverifiedShow Answer

The genotypes and phenotypes that result from a cross of AA and Aa (A = normal pigmentation and a = albinism) are

Correct AnswerverifiedShow Answer

The processes that pass genetic information from generation to generation are

Correct AnswerverifiedShow Answer

How alike are our genomes?

Correct AnswerverifiedShow Answer

Which of the following prenatal tests is non-invasive?

Correct AnswerverifiedShow Answer

The phenotypes and genotypes that result from a cross of Aa and aa (A = normal pigmentation and a = albinism) are

Correct AnswerverifiedShow Answer

A human male is hemizygous for genes on the X chromosome because he has two copies of that chromosome.

Correct AnswerverifiedShow Answer

Genetic information passes from protein to RNA to DNA.

Correct AnswerverifiedShow Answer

Different alleles of the same gene are said to be

Correct AnswerverifiedShow Answer

Amniocentesis provides an image of a developing fetus.

Correct AnswerverifiedShow Answer

An autosomal dominant condition in a family will disappear if in any generation no one inherits the disease.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

An example of a sex-influenced trait is

Correct AnswerverifiedShow Answer

During amniocentesis

Correct AnswerverifiedShow Answer

An inverted bell-shaped curve represents the distribution of phenotypes of a multifactorial trait in a population.

Correct AnswerverifiedShow Answer

Polydactyly is an example of a trait that is both ___________ and variably expressive.

Correct AnswerverifiedShow Answer

The field of genetics deals only with disease.

Correct AnswerverifiedShow Answer

Gene expression profiling

Correct AnswerverifiedShow Answer

A recessive allele masks the effect of a dominant allele.

Correct AnswerverifiedShow Answer

The two general types of chromosomes are

Correct AnswerverifiedShow Answer

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