Question 1

Chromosome abnormalities include having a number other than 46, a chromosome that has an inverted sequence, and different chromosome types that exchange parts.

Accepted Answer

A) True 
 B)False  True

Question 2

Genes have multiple alleles that differ in DNA sequence because a gene consists of many nucleotides, each of which can be any of four types.

Accepted Answer

A) True 
 B)False  True

Question 3

The human genome contains millions of different genes.

Accepted Answer

A) True 
 B)False  False

Question 4

If a Y-bearing sperm fertilizes an XX egg, the resulting individual would be

Accepted Answer

A)   an XX female.
B)   an XY male.
C)   a male with XXY syndrome.
D)   a female with XXY syndrome.

Question 5

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.

Question 6

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

Accepted Answer

A) True 
 B)False

Question 7

Hemophilia A is

Accepted Answer

A)   due to an X-linked dominant gene.
B)   passed from affected males to their sons.
C)   more common in females.
D)   a defect in the clotting mechanism.

Question 8

A baby has three copies of each chromosome in every cell. She is

Accepted Answer

A)   euploid.
B)   aneuploid.
C)   diploid.
D)   polyploid.

Question 9

Gender determination for males reflects expression of

Accepted Answer

A)   the SRY gene but not the Wnt4 gene.
B)   the Wnt4 gene but not the SRY gene.
C)   both the SRY and Wnt4 genes.
D)   the entire Y chromosome.

Question 10

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

Accepted Answer

A) True 
 B)False

Question 11

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 12

The origin of the 46 chromosomes in a human zygote is

Accepted Answer

A)   all from the sperm cell.
B)   half from DNA and half from RNA.
C)   half from the sperm and half from the egg.
D)   all from the egg.

Question 13

Chorionic villus sampling can be performed earlier in pregnancy than amniocentesis.

Accepted Answer

A) True 
 B)False

Question 14

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

Accepted Answer

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

Question 15

In genomic imprinting, the sex of a parent transmitting an allele is important in the phenotype of the offspring.

Accepted Answer

A) True 
 B)False

Question 16

Most of the DNA in the human genome encodes protein.

Accepted Answer

A) True 
 B)False

Question 17

A disorder that skips generations, affects both sexes, and is transmitted by parents who either have the condition or carry it is autosomal recessive.

Accepted Answer

A) True 
 B)False

Question 18

A genotype that does not affect everyone who inherits it is completely penetrant.

Accepted Answer

A) True 
 B)False

Question 19

A pedigree is a chart that aligns chromosome pairs by size.

Accepted Answer

A) True 
 B)False

Question 20

We can predict the likelihood of a particular inherited trait occurring in a particular family member by consulting the ways that genes are transmitted on chromosomes.

Accepted Answer

A) True 
 B)False

Exam 24: Genetics and Genomics

Chromosome abnormalities include having a number other than 46, a chromosome that has an inverted sequence, and different chromosome types that exchange parts.

Genes have multiple alleles that differ in DNA sequence because a gene consists of many nucleotides, each of which can be any of four types.

The human genome contains millions of different genes.

If a Y-bearing sperm fertilizes an XX egg, the resulting individual would be

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

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

Hemophilia A is

A baby has three copies of each chromosome in every cell. She is

Gender determination for males reflects expression of

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

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

The origin of the 46 chromosomes in a human zygote is

Chorionic villus sampling can be performed earlier in pregnancy than amniocentesis.

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

In genomic imprinting, the sex of a parent transmitting an allele is important in the phenotype of the offspring.

Most of the DNA in the human genome encodes protein.

A disorder that skips generations, affects both sexes, and is transmitted by parents who either have the condition or carry it is autosomal recessive.

A genotype that does not affect everyone who inherits it is completely penetrant.

A pedigree is a chart that aligns chromosome pairs by size.

We can predict the likelihood of a particular inherited trait occurring in a particular family member by consulting the ways that genes are transmitted on chromosomes.