Question 1

Which of the following represents a gamete with a dominant allele?

Accepted Answer

A) A 
B) b 
C) AA 
D) Aa 
E) bb 
A) A 
B) b 
C) AA 
D) Aa 
E) bb A

Question 2

If two parents who are unaffected have a child that is affected,then the parents are both considered bearers.

Accepted Answer

A) True 
 B)False  False

Question 3

Which of the following would not be a possible way to list someone's genotype?

Accepted Answer

A) BB 
B) Bb 
C) AB 
D) bb 
E) AA 
A) BB 
B) Bb 
C) AB 
D) bb 
E) AA C

Question 4

Describe what is meant by a polygenic traits.

Accepted Answer

Polygenic traits are governed by several

Question 5

There are two different alleles for the number of fingers on the hands: 5 finger allele and 6 finger allele.When both the 5 finger allele and the 6 finger allele are present in the same individual,the individual has 6 fingers on the hands.Which allele is dominant?

Accepted Answer

A) 5 fingers 
B) 6 fingers 
C) 1 finger 
D) 11 fingers 
E) 7 fingers 
A) 5 fingers 
B) 6 fingers 
C) 1 finger 
D) 11 fingers 
E) 7 fingers

Question 6

What is the genotype of a person with type O blood?

Accepted Answer

A) IAIA 
B) IAIB 
C) IAi 
D) IBi 
E) ii 
A) IAIA 
B) IAIB 
C) IAi 
D) IBi 
E) ii

Question 7

In a cross of a homozygous dominant parent and a homozygous recessive parent,what is the ratio of offspring that will exhibit the recessive phenotype?

Accepted Answer

A) 0. 
B) 1/4. 
C) 1/2. 
D) 3/4. 
E) 1. 
A) 0. 
B) 1/4. 
C) 1/2. 
D) 3/4. 
E) 1.

Question 8

It is estimated that there are fewer than 100 genetic diseases caused by single gene mutations in humans.

Accepted Answer

A) True 
 B)False

Question 9

In a dihybrid cross,if the resulting ratios are 1:1:1:1,what are the genotypes of the parents?

Accepted Answer

A) GgRr x ggrr 
B) GGRR x ggrr 
C) GgRr x GgRr 
D) Gg x Rr 
E) GG x RR 
A) GgRr x ggrr 
B) GGRR x ggrr 
C) GgRr x GgRr 
D) Gg x Rr 
E) GG x RR

Question 10

Which of the following traits is an X-linked recessive disorder?

Accepted Answer

A) Color blindness 
B) Tay-Sachs 
C) Cystic fibrosis 
D) Sickle-cell disease 
E) Marfan syndrome 
A) Color blindness 
B) Tay-Sachs 
C) Cystic fibrosis 
D) Sickle-cell disease 
E) Marfan syndrome

Question 11

Which of the following represents a dihybrid cross?

Accepted Answer

A) ff x ff 
B) Gg x gg 
C) AAbb x Aabb 
D) AAbb x aaBB 
E) Ss x ss 
A) ff x ff 
B) Gg x gg 
C) AAbb x Aabb 
D) AAbb x aaBB 
E) Ss x ss

Question 12

Clasp your hands together (without thinking about it).Which thumb is on top every time you do this? The dominant phenotype is left thumb on top.If you have the genotype "tt",which thumb is on top?

Accepted Answer

A) left 
B) right 
C) left 50% of the time and right 50% of the time 
D) left 25% of the time and right 75% of the time 
E) left 75% of the time and right 25% of the time 
A) left 
B) right 
C) left 50% of the time and right 50% of the time 
D) left 25% of the time and right 75% of the time 
E) left 75% of the time and right 25% of the time

Question 13

Which of the following is an example of a recessive genotype?

Accepted Answer

A) aa 
B) Aa 
C) short 
D) AA 
E) ab 
A) aa 
B) Aa 
C) short 
D) AA 
E) ab

Question 14

In a pedigree,an affected male would be designated by

Accepted Answer

A) an open circle. 
B) a shaded circle. 
C) an open square. 
D) a shaded square. 
E) a square with a line through it. 
A) an open circle. 
B) a shaded circle. 
C) an open square. 
D) a shaded square. 
E) a square with a line through it.

Question 15

Which of the following is not a characteristic of an X-linked recessive disorder pedigree?

Accepted Answer

A) An affected son can have normal parents. 
B) If a female has the trait,her father must also have it. 
C) The characteristic often skips a generation. 
D) More females than males are affecteD. 
E) If a woman has the characteristic,all of her sons will have it. 
A) An affected son can have normal parents. 
B) If a female has the trait,her father must also have it. 
C) The characteristic often skips a generation. 
D) More females than males are affecteD. 
E) If a woman has the characteristic,all of her sons will have it.

Question 16

Can two parents that have a genetic disorder ever have a normal child?

Accepted Answer

Yes,if they are het

Question 17

How are Fragile X syndrome and Huntington disease similar?

Accepted Answer

A) Both exhibit a late onset in life. 
B) Both are trinucleotide repeat expansion disorders. 
C) Both affect the muscles and lead to eventual paralysis. 
D) Both cause autism. 
E) Both are found only in males. 
A) Both exhibit a late onset in life. 
B) Both are trinucleotide repeat expansion disorders. 
C) Both affect the muscles and lead to eventual paralysis. 
D) Both cause autism. 
E) Both are found only in males.

Question 18

If a mother is a carrier for color-blindness and her husband is not,which of the following children are most likely?

Accepted Answer

A) 1 normal daughter,1 carrier daughter,1 normal son,and 1 color-blind son 
B) 2 normal daughters,1 normal son,and 1 color-blind son 
C) 2 carrier daughters,1 normal son,and 1 color-blind son 
D) 1 normal daughter,1 carrier daughter,and 2 normal sons 
E) 1 normal daughter,1 carrier daughter,and 2 color-blind sons 
A) 1 normal daughter,1 carrier daughter,1 normal son,and 1 color-blind son 
B) 2 normal daughters,1 normal son,and 1 color-blind son 
C) 2 carrier daughters,1 normal son,and 1 color-blind son 
D) 1 normal daughter,1 carrier daughter,and 2 normal sons 
E) 1 normal daughter,1 carrier daughter,and 2 color-blind sons

Question 19

An allele is to a gene,as a locus is to a

Accepted Answer

A) gamete. 
B) phenotype. 
C) chromosome. 
D) genotype. 
E) unit of heredity. 
A) gamete. 
B) phenotype. 
C) chromosome. 
D) genotype. 
E) unit of heredity.

Question 20

Explain the problems associated with the genetic disorder Tay-Sachs.A.This lysosome is responsible for clearing out the fatty acid proteins that build up in the cells of the brain.The build up begins to interfere with proper brain development and growth.This leads to malfunctions in vision,movement,hearing,and overall mental development.The impairment leads to blindness,seizures,and paralysis.

Accepted Answer

Affected children w

Exam 21: Patterns of Genetic Inheritance

Which of the following represents a gamete with a dominant allele?

If two parents who are unaffected have a child that is affected,then the parents are both considered bearers.

Which of the following would not be a possible way to list someone's genotype?

Describe what is meant by a polygenic traits.

There are two different alleles for the number of fingers on the hands: 5 finger allele and 6 finger allele.When both the 5 finger allele and the 6 finger allele are present in the same individual,the individual has 6 fingers on the hands.Which allele is dominant?

What is the genotype of a person with type O blood?

In a cross of a homozygous dominant parent and a homozygous recessive parent,what is the ratio of offspring that will exhibit the recessive phenotype?

It is estimated that there are fewer than 100 genetic diseases caused by single gene mutations in humans.

In a dihybrid cross,if the resulting ratios are 1:1:1:1,what are the genotypes of the parents?

Which of the following traits is an X-linked recessive disorder?

Which of the following represents a dihybrid cross?

Clasp your hands together (without thinking about it).Which thumb is on top every time you do this? The dominant phenotype is left thumb on top.If you have the genotype "tt",which thumb is on top?

Which of the following is an example of a recessive genotype?

In a pedigree,an affected male would be designated by

Which of the following is not a characteristic of an X-linked recessive disorder pedigree?

Can two parents that have a genetic disorder ever have a normal child?

How are Fragile X syndrome and Huntington disease similar?

If a mother is a carrier for color-blindness and her husband is not,which of the following children are most likely?

An allele is to a gene,as a locus is to a

Exploring Life and Science

Chemistry of Life

Cell Structure and Function

Organization and Regulation of Body Systems

Cardiovascular System: Heart and Blood Vessels

Cardiovascular System: Blood

The Lymphatic and Immune Systems

Biology of Infectious Diseases

Digestive System and Nutrition

Respiratory System

Urinary System

Skeletal System

Muscular System

Nervous System

Senses

Endocrine System

Reproductive System

Development and Aging

Patterns of Chromosome Inheritance

Cancer

DNA Biology and Technology

Human Evolution

Global Ecology and Human Interferences

Human Population,global Resources,and Conservation

Filters