Question 1

Hemophilia is an X-linked recessive trait in humans. If phenotypically normal parents have children without hemophilia, pedigree analysis

Accepted Answer

A)  could demonstrate that neither parent carries the hemophiliac allele. 
B)  would show that none of their children is a carrier of the hemophilia allele. 
C)  would show that none of their children could have hemophiliac children. 
D)  would not be able to show the exact genotypes of the parents or children.

Question 2

In human ABO blood types, the alleles for A and B are said to be ________ because they're both expressed.

Accepted Answer

The answer of In human ABO blood types, the alleles...

Question 3

Queen Elizabeth II of England is a descendant of Edward VII of England, who was the son of Queen Victoria. Edward VII did not have hemophilia. Prince Philip, who is married to Queen Elizabeth II, is a descendant of Alice, the daughter of Queen Victoria. Alice was a carrier of hemophilia. However, Prince Philip does not have hemophilia. What can you assume about the children of Queen Elizabeth II and Prince Philip?

Accepted Answer

A)  None of the children could have the hemophilia allele. 
B)  Only the sons could have the hemophilia allele. 
C)  Only their daughter could have the hemophilia allele. 
D)  Any one of the children could have the hemophilia allele.

Question 4

People with the same blood type

Accepted Answer

A)  are always unrelated. 
B)  are always related. 
C)  may or may not be related. 
D)  always have both alleles in common but are not necessarily related.

Question 5

A woman with type AB blood has sugars on what percent of her red blood cells?

Accepted Answer

A)  0% 
B)  25% 
C)  50% 
D)  100%

Question 6

The AB blood type, in which both A and B alleles are expressed, is an example of

Accepted Answer

A)  incomplete dominance. 
B)  codominance. 
C)  independent assortment. 
D)  sex linkage.

Question 7

A woman with type A blood has the alleles IA and i. Her blood type is a result of

Accepted Answer

A)  polygenic inheritance. 
B)  simple dominance. 
C)  codominance. 
D)  sex-linked recessive inheritance.

Question 8

Polydactyly is a dominant trait. A male who has polydactyly would be represented by what symbol on a pedigree chart?

Accepted Answer

A)  a half-shaded square 
B)  a shaded square 
C)  a half-shaded circle 
D)  a clear circle

Question 9

VNTRs are

Accepted Answer

A)  fragments of DNA that have been denatured. 
B)  nucleotide sequences that correspond to specific genes. 
C)  distinct nucleotide sequences that everyone has in different numbers. 
D)  nucleotide sequences that are different in different individuals.

Question 10

Type AB blood is a result of

Accepted Answer

A)  polygenic inheritance. 
B)  simple dominance. 
C)  codominance. 
D)  sex-linked recessive inheritance.

Question 11

The enzyme used to synthesize daughter strands of DNA during PCR is called a ________.

Accepted Answer

A)  replicase. 
B)  DNA polymerase. 
C)  RNA polymerase. 
D)  Taq polymerase.

Question 12

The alleles responsible for the ABO blood types of humans are an example of ________ alleles.

Accepted Answer

The answer of The alleles responsible for the ABO blood...

Question 13

DNA fragments must be denatured during the polymerase chain reaction due to which of the following?

Accepted Answer

A)  Taq polymerase breaks down when heated 
B)  the repeated gene sequences are not present in double-stranded DNA 
C)  the primer must bind to a single-stranded template to synthesize double-stranded DNA 
D)  VNTRs have DNA sequences that vary in number

Question 14

What is the most common blood type in the U.S. population?

Accepted Answer

A)  type O- 
B)  type B+ 
C)  type AB- 
D)  type O+

Question 15

Which of the following is used to produce genetic fingerprints of people?

Accepted Answer

A)  RNA polymerase 
B)  Punnett squares 
C)  pedigree analysis 
D)  VNTRs

Question 16

Which of the following individuals doesn't have the Rh factor on their red blood cells?

Accepted Answer

A)  Rh+ Rh+ 
B)  Rh+ Rh- 
C)  Rh- Rh- 
D)  Rh- Rh-ز

Question 17

In DNA fingerprinting, amplified fragments of DNA are separated from one another by which process?

Accepted Answer

A)  filtering 
B)  chromatography 
C)  electrophoresis 
D)  PCR (polymerase chain reaction)

Question 18

What is responsible for the tortoiseshell phenotype in some female cats?

Accepted Answer

A)  codominance 
B)  X inactivation 
C)  incomplete dominance 
D)  pleiotropy

Question 19

Which of the following types of forensic evidence was available for scientists studying the case of the Romanovs?

Accepted Answer

A)  fingerprint 
B)  toxicology 
C)  DNA 
D)  footprint

Question 20

A man who carries a harmful allele for a sex-linked gene (on the X chromosome)will pass the allele on to

Accepted Answer

A)  all of his daughters. 
B)  only half of his daughters. 
C)  only half of his sons. 
D)  all of his children.

Exam 8: DNA Detective: Complex Patterns of Inheritance and DNA Fingerprinting