Question 1

A(n)_____ cross yields a genotypic ratio of 1:2:1 and a phenotypic ratio of 3:1.

Accepted Answer

A) allelic 
B) monohybrid 
C) test 
D) dihybrid 
A) allelic 
B) monohybrid 
C) test 
D) dihybrid B

Question 2

Which of the following genotypes is homozygous?

Accepted Answer

A) RRYY 
B) RryY 
C) RrYy 
D) Rryy 
A) RRYY 
B) RryY 
C) RrYy 
D) Rryy A

Question 3

In a human pedigree that traces the inheritance of albinism,a filled square represents a

Accepted Answer

A) male with albinism. 
B) female with albinism. 
C) heterozygous male. 
D) heterozygous female. 
A) male with albinism. 
B) female with albinism. 
C) heterozygous male. 
D) heterozygous female. A

Question 4

Eric and Janelle are carriers of the recessive allele causing Tay-Sachs disease,which is lethal in early childhood.If they have a healthy child,what is the probability that this child would NOT be a carrier of Tay-Sachs disease?

Accepted Answer

A) 1 
B) 2/3 
C) 1/2 
D) 1/3 
A) 1 
B) 2/3 
C) 1/2 
D) 1/3

Question 5

One reason that diseases caused by recessive alleles remain in populations is that

Accepted Answer

A) they do not run in families. 
B) they often do not produce symptoms until a person has already had children. 
C) they affect more females than males. 
D) they are more curable than recessive diseases. 
A) they do not run in families. 
B) they often do not produce symptoms until a person has already had children. 
C) they affect more females than males. 
D) they are more curable than recessive diseases.

Question 6

Mendel's laws derive from

Accepted Answer

A) mitosis. 
B) meiosis. 
C) processes unique to pea plants. 
D) calculus and algebra. 
A) mitosis. 
B) meiosis. 
C) processes unique to pea plants. 
D) calculus and algebra.

Question 7

Which of these compares the DNA sequences of the genomes of the members of a family?

Accepted Answer

A) Punnet square 
B) Dihybrid cross 
C) Family exome analysis 
D) Pedigree analysis 
A) Punnet square 
B) Dihybrid cross 
C) Family exome analysis 
D) Pedigree analysis

Question 8

Cystic fibrosis is autosomal recessive.This means that

Accepted Answer

A) both sexes can be affected and can "skip" generations through carriers. 
B) carrier mothers pass the mutation to some of their sons,but not to their daughters. 
C) each affected individual has at least one affected parent. 
D) both sexes are affected because new mutations occur frequently. 
A) both sexes can be affected and can "skip" generations through carriers. 
B) carrier mothers pass the mutation to some of their sons,but not to their daughters. 
C) each affected individual has at least one affected parent. 
D) both sexes are affected because new mutations occur frequently.

Question 9

The difference in mode of inheritance between Huntington disease and cystic fibrosis is that

Accepted Answer

A) Huntington disease skips generations and only affects children,whereas cystic fibrosis can strike at any age and never skips generations. 
B) Huntington disease does not skip generations but cystic fibrosis can. 
C) A person with Huntington disease can have unaffected parents,but a person with cystic fibrosis must have an affected parent. 
D) Huntington disease affects females and cystic fibrosis affects males. 
A) Huntington disease skips generations and only affects children,whereas cystic fibrosis can strike at any age and never skips generations. 
B) Huntington disease does not skip generations but cystic fibrosis can. 
C) A person with Huntington disease can have unaffected parents,but a person with cystic fibrosis must have an affected parent. 
D) Huntington disease affects females and cystic fibrosis affects males.

Question 10

A very difficult aspect of Huntington disease is that

Accepted Answer

A) it affects different people in a family at very different ages. 
B) it affects different people in a family in different parts of the body. 
C) it affects different people in a family in different parts of the brain. 
D) a family may include individuals at different stages of the illness. 
A) it affects different people in a family at very different ages. 
B) it affects different people in a family in different parts of the body. 
C) it affects different people in a family in different parts of the brain. 
D) a family may include individuals at different stages of the illness.

Question 11

For two traits A and B with two alleles each,the genotypes of the gametes that a heterozygote would produce are

Accepted Answer

A) AB,Ab,aB,ab. 
B) Ab and aB. 
C) AB,ab,Ab. 
D) AA,BB,aa,bb,and Ab. 
A) AB,Ab,aB,ab. 
B) Ab and aB. 
C) AB,ab,Ab. 
D) AA,BB,aa,bb,and Ab.

Question 12

The wild type eye color for humans is

Accepted Answer

A) brown. 
B) green. 
C) hazel. 
D) pink. 
A) brown. 
B) green. 
C) hazel. 
D) pink.

Question 13

Mode of inheritance reflects

Accepted Answer

A) whether a gene is on an autosome or sex chromosome and whether the allele is recessive or dominant. 
B) whether the allele is transmitted from the male or the female. 
C) the number of genes that determine a trait. 
D) the size of the chromosome that includes the gene in question and the sex of the parent transmitting it. 
A) whether a gene is on an autosome or sex chromosome and whether the allele is recessive or dominant. 
B) whether the allele is transmitted from the male or the female. 
C) the number of genes that determine a trait. 
D) the size of the chromosome that includes the gene in question and the sex of the parent transmitting it.

Question 14

Ian and Bryony are both carriers for two autosomal recessive disorders,PKU (chromosome 12)and cystic fibrosis (chromosome 7).They are expecting a daughter.What is the probability that she will have PKU but not CF?

Accepted Answer

A) 9/16 
B) 3/16 
C) 1/2 
D) 1/16 
A) 9/16 
B) 3/16 
C) 1/2 
D) 1/16

Question 15

Mendel followed the transmission of traits through several generations in

Accepted Answer

A) frogs. 
B) peas. 
C) bacteria. 
D) the mustard weeD. 
A) frogs. 
B) peas. 
C) bacteria. 
D) the mustard weeD.

Question 16

In a family that starts with you,your grandchildren would be the _____ generation.

Accepted Answer

A) P1 
B) P2 
C) F1 
D) F2 
A) P1 
B) P2 
C) F1 
D) F2

Question 17

In the Foofnagle family,the trait of being able to yodel affects members of both sexes in every generation.This trait could be

Accepted Answer

A) autosomal recessive or autosomal dominant. 
B) autosomal dominant but not autosomal recessive. 
C) conclusive or inconclusive. 
D) caused by something in the environment and not inherited at all. 
A) autosomal recessive or autosomal dominant. 
B) autosomal dominant but not autosomal recessive. 
C) conclusive or inconclusive. 
D) caused by something in the environment and not inherited at all.

Question 18

Family exome analysis compares the complete genome sequences of the members of a family.

Accepted Answer

A) True 
 B)False

Question 19

The inheritance of eye color indicates that

Accepted Answer

A) many different genes determine eye color,each contributing to different degrees. 
B) eye color is sensitive to what a pregnant woman eats. 
C) other characteristics,such as the texture at the back of the eye,can affect the phenotype. 
D) a person's sex influences inheritance of eye color. 
A) many different genes determine eye color,each contributing to different degrees. 
B) eye color is sensitive to what a pregnant woman eats. 
C) other characteristics,such as the texture at the back of the eye,can affect the phenotype. 
D) a person's sex influences inheritance of eye color.

Question 20

In a human pedigree that traces the inheritance of sickle cell disease,a half-filled circle represents a

Accepted Answer

A) female with the disease. 
B) heterozygous male. 
C) heterozygous female. 
D) individual who dieD. 
A) female with the disease. 
B) heterozygous male. 
C) heterozygous female. 
D) individual who dieD.

Exam 4: Single-Gene Inheritance

A(n)_____ cross yields a genotypic ratio of 1:2:1 and a phenotypic ratio of 3:1.

Which of the following genotypes is homozygous?

In a human pedigree that traces the inheritance of albinism,a filled square represents a

Eric and Janelle are carriers of the recessive allele causing Tay-Sachs disease,which is lethal in early childhood.If they have a healthy child,what is the probability that this child would NOT be a carrier of Tay-Sachs disease?

One reason that diseases caused by recessive alleles remain in populations is that

Mendel's laws derive from

Which of these compares the DNA sequences of the genomes of the members of a family?

Cystic fibrosis is autosomal recessive.This means that

The difference in mode of inheritance between Huntington disease and cystic fibrosis is that

A very difficult aspect of Huntington disease is that

For two traits A and B with two alleles each,the genotypes of the gametes that a heterozygote would produce are

The wild type eye color for humans is

Mode of inheritance reflects

Ian and Bryony are both carriers for two autosomal recessive disorders,PKU (chromosome 12)and cystic fibrosis (chromosome 7).They are expecting a daughter.What is the probability that she will have PKU but not CF?

Mendel followed the transmission of traits through several generations in

In a family that starts with you,your grandchildren would be the _____ generation.

In the Foofnagle family,the trait of being able to yodel affects members of both sexes in every generation.This trait could be

Family exome analysis compares the complete genome sequences of the members of a family.

The inheritance of eye color indicates that

In a human pedigree that traces the inheritance of sickle cell disease,a half-filled circle represents a

What Is in a Human Genome

Cells

Meiosis,Development and Aging

Beyond Mendels Laws

Matters of Sex

Multifactorial Traits

Genetics of Behavior

DNA Structure and Replication

Gene Action: From DNA to Protein

Gene Expression and Epigenetics

Gene Mutation

Chromosomes

Constant Allele Frequencies

Changing Allele Frequencies

Human Ancestry and Evolution

Genetics of Immunity

Cancer Genetics and Genomics

Genetic Technologies: Patenting, modifying, and Monitoring Dna

Genetic Testing and Treatment

Reproductive Technologies

Genomics

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