Question 1

A cross of two second-generation,straight-shorthaired individuals would yield what phenotype?

Accepted Answer

A cross of two second-generati

Question 2

Alleles may code for alternative expressions of a genetic trait.

Accepted Answer

A) True 
 B)False

Question 3

Match the following:
-An unremitting,fatal nervous system disease involving degeneration of the basal nuclei.

Accepted Answer

A) Cystic fibrosis 
B) Achondroplasia 
C) Albinism 
D) Tay-Sachs disease 
E) Huntington's disease 
A) Cystic fibrosis 
B) Achondroplasia 
C) Albinism 
D) Tay-Sachs disease 
E) Huntington's disease

Question 4

Parents are informed after an amniocentesis that the results show a baby who has an extra number 21 chromosome.Should there be concern and what might the problem be?

Accepted Answer

The fetus will become a Down s

Question 5

The same allele can have a different effect depending on which parent it comes from.

Accepted Answer

A) True 
 B)False

Question 6

Amy's hand was exposed to X rays.A gene in a skin cell of her hand mutated.This mutant gene will ________.

Accepted Answer

A)  not form an exact duplicate of itself when the cell divides 
B)  definitely cause skin cancer 
C)  replicate itself when the cell divides but will not be passed on to Amy's offspring 
D)  replicate itself and be passed on to Amy's children 
A)  not form an exact duplicate of itself when the cell divides 
B)  definitely cause skin cancer 
C)  replicate itself when the cell divides but will not be passed on to Amy's offspring 
D)  replicate itself and be passed on to Amy's children

Question 7

Match the following:
-A particular gene's allele received by a gamete has no influence over selection of a different gene's allele.

Accepted Answer

A) Independent assortment 
B) Chromosome segregation 
C) Chromosome crossover 
D) Gene recombination 
A) Independent assortment 
B) Chromosome segregation 
C) Chromosome crossover 
D) Gene recombination

Question 8

Assume that brown eyes (B)are dominant over blue (b); and right-handedness (R)is dominant over left-handedness (r).A brown-eyed,right-handed man marries a blue-eyed,right-handed woman.Their first child is brown-eyed and right-handed,and their second child is blue-eyed and left-handed.What are the genotypes of the parents?

Accepted Answer

The man has a BbRr g

Question 9

Define phenocopy.

Accepted Answer

Environmentally prod

Question 10

A Punnett square is a diagram that may be used to figure out the possible combinations of genes for a trait.

Accepted Answer

A) True 
 B)False

Question 11

Select the statement that best describes the difference between a gene and an allele.

Accepted Answer

A)  Genes code for a single protein or a single trait while an allele can code for many traits or many proteins. 
B)  Genes follow Mendelian patterns of inheritance while alleles follow non-Mendelian patterns of inheritance. 
C)  Alleles are found on chromosomes while genes are independent. 
D)  Genes express a specific trait while alleles are variations of a particular gene that result in the variation we see in a genetic individual trait. 
A)  Genes code for a single protein or a single trait while an allele can code for many traits or many proteins. 
B)  Genes follow Mendelian patterns of inheritance while alleles follow non-Mendelian patterns of inheritance. 
C)  Alleles are found on chromosomes while genes are independent. 
D)  Genes express a specific trait while alleles are variations of a particular gene that result in the variation we see in a genetic individual trait.

Question 12

In incomplete dominance,the heterozygote has a phenotype intermediate between that of homozygous-dominant and homozygous-recessive individuals.

Accepted Answer

A) True 
 B)False

Question 13

Match the following:
-Distribution of chromosomes to different gametes.

Accepted Answer

A) Independent assortment 
B) Chromosome segregation 
C) Chromosome crossover 
D) Gene recombination 
A) Independent assortment 
B) Chromosome segregation 
C) Chromosome crossover 
D) Gene recombination

Question 14

Of the different sources of genetic variability which one produces the variation in the combinations of alleles on a single chromosome?

Accepted Answer

A)  independent assortment 
B)  crossing over 
C)  random fertilization 
D)  mutation 
A)  independent assortment 
B)  crossing over 
C)  random fertilization 
D)  mutation

Question 15

Mitochondrial genes are free of errors.As a result,all genetic problems are due exclusively to nuclear genes.

Accepted Answer

A) True 
 B)False

Question 16

Huntington's disease involves ________.

Accepted Answer

A)  hypersecretion of growth hormone 
B)  the presence of an extra chromosome 
C)  hyposecretion of thyroxine 
D)  degeneration of the basal nuclei of the brain 
A)  hypersecretion of growth hormone 
B)  the presence of an extra chromosome 
C)  hyposecretion of thyroxine 
D)  degeneration of the basal nuclei of the brain

Question 17

Which of the following is true concerning environmental influence on genetic expression?

Accepted Answer

A)  The only time a gene can be influenced by environmental factors is in the second trimester of pregnancy. 
B)  Drugs and nutrition can alter normal gene expression. 
C)  It is impossible to alter in any way the expression of a gene in humans. 
D)  Environmental factors determine the way in which 90 percent of our genes are expressed. 
A)  The only time a gene can be influenced by environmental factors is in the second trimester of pregnancy. 
B)  Drugs and nutrition can alter normal gene expression. 
C)  It is impossible to alter in any way the expression of a gene in humans. 
D)  Environmental factors determine the way in which 90 percent of our genes are expressed.

Question 18

If a person is homozygous for a particular trait this means ________.

Accepted Answer

A)  the person has two dominant alleles for the gene responsible for the trait 
B)  the person will not have a recessive condition 
C)  the person has two identical alleles for the gene responsible for the trait 
D)  the person cannot pass on that trait 
A)  the person has two dominant alleles for the gene responsible for the trait 
B)  the person will not have a recessive condition 
C)  the person has two identical alleles for the gene responsible for the trait 
D)  the person cannot pass on that trait

Question 19

The term lethal dominant gene indicates that the gene causes death only when the individual is homozygous.

Accepted Answer

A) True 
 B)False

Question 20

Most genetic disorders are inherited through dominant genes.

Accepted Answer

A) True 
 B)False

Exam 29: Heredity

A cross of two second-generation,straight-shorthaired individuals would yield what phenotype?

Alleles may code for alternative expressions of a genetic trait.

Match the following: -An unremitting,fatal nervous system disease involving degeneration of the basal nuclei.

Parents are informed after an amniocentesis that the results show a baby who has an extra number 21 chromosome.Should there be concern and what might the problem be?

The same allele can have a different effect depending on which parent it comes from.

Amy's hand was exposed to X rays.A gene in a skin cell of her hand mutated.This mutant gene will ________.

Match the following: -A particular gene's allele received by a gamete has no influence over selection of a different gene's allele.

Define phenocopy.

A Punnett square is a diagram that may be used to figure out the possible combinations of genes for a trait.

Select the statement that best describes the difference between a gene and an allele.

In incomplete dominance,the heterozygote has a phenotype intermediate between that of homozygous-dominant and homozygous-recessive individuals.

Match the following: -Distribution of chromosomes to different gametes.

Of the different sources of genetic variability which one produces the variation in the combinations of alleles on a single chromosome?

Mitochondrial genes are free of errors.As a result,all genetic problems are due exclusively to nuclear genes.

Huntington's disease involves ________.

Which of the following is true concerning environmental influence on genetic expression?

If a person is homozygous for a particular trait this means ________.

The term lethal dominant gene indicates that the gene causes death only when the individual is homozygous.

Most genetic disorders are inherited through dominant genes.

The Human Body: an Orientation

Chemistry Comes Alive

Cells: the Living Units

Tissue: the Living Fabric

The Integumentary System

Bones and Skeletal Tissue

The Skeleton

Joints

Muscles and Muscle Tissue

The Muscular System

Fundamentals of the Nervous System and Nervous Tissue

The Central Nervous System

The Peripheral Nervous System and Reflex Activity

The Autonomic Nervous System

The Special Senses

The Endocrine System

Blood

The Cardiovascular System: the Heart

The Cardiovascular System: Blood Vessels

The Lymphatic System and Lymphoid Organs and Tissues

The Immune System: Innate and Adaptive Body Defenses

The Respiratory System

The Digestive System

Nutrition,metabolism,and Body Temperature Regulation

The Urinary System

Fluid,electrolyte,and Acid-Base Balance

The Reproductive System

Pregnancy and Human Development

Filters