Download I. The Emerging Role of Genetics and Genomics in Medicine

Shier, Butler, and Lewis: Hole’s Human Anatomy and Physiology, 10 th ed.
Chapter 24: Genetics and Genomics
Chapter 24: Genetics and Genomics
I. The Emerging Role of Genetics and Genomics in Medicine
A. Genetics is ____________________________________________________________
B. Genes are _____________________________________________________________
C. Chromosomes are ______________________________________________________
D. A gene’s nucleotide sequence tells a cell ____________________________________
________________________________________________________________________
E. A genome is ___________________________________________________________
F. Somatic cells have ______________________________________________________
G. Diploid means _________________________________________________________
H. Sex cells have _________________________________________________________
I. Haploid means _________________________________________________________
J. Genomics is ___________________________________________________________
K. Proteonomics focuses on _________________________________________________
________________________________________________________________________
L. Environmental factors that affect how genes are expressed are ___________________
________________________________________________________________________
II. Modes of Inheritance
A. Introduction
1. The probability that a certain trait will occur in the offspring of two individuals
can be determined by ________________________________________________
__________________________________________________________________
B. Chromosomes and Genes Come in Pairs
1. Karyotypes are ___________________________________________________
__________________________________________________________________
2. Autosomes are ___________________________________________________
3. Sex chromosomes are _____________________________________________
__________________________________________________________________
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4. Most chromosomes contain ___________________________________ genes.
5. Alleles are ______________________________________________________
6. Homozygous alleles are ____________________________________________
7. Heterozygous alleles are ___________________________________________
8. Genotype is _____________________________________________________
9. Phenotype is _____________________________________________________
10. A wild type allele is ______________________________________________
11. A mutant allele is ________________________________________________
C. Dominant and Recessive Inheritance
1. A dominant allele is _______________________________________________
2. A recessive allele is _______________________________________________
__________________________________________________________________
3. An autosomal gene is located _______________________________________
4. An X-linked gene is located _________________________________________
5. A Y-linked gene is located __________________________________________
6. Mode of inheritance refers to ________________________________________
__________________________________________________________________
7. An autosomal condition is equally likely to affect _______________________
8. X-linked characteristics affect _______________________________________
9. Recessive conditions can skip a generation because ______________________
__________________________________________________________________
10. Dominant conditions do not skip generations because ___________________
__________________________________________________________________
11. The disease ____________________________ is an example of an autosomal
recessive disorder.
12. If both parents are heterozygotes for the trait that causes cystic fibrosis, there
is a ________________ chance that their offspring will be homozygous dominant,
a _____________________________ chance their offspring will be heterozygous,
and a __________________ chance their offspring will be homozygous recessive.
13. A Punnet square is _______________________________________________
__________________________________________________________________
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14. A pedigree is ___________________________________________________
__________________________________________________________________
15. An example of an autosomal dominant disorder is ______________________
__________________________________________________________________
D. Different Dominance Relationships
1. Incomplete dominance is ___________________________________________
__________________________________________________________________
2. An example of a trait inherited through incomplete dominance is ___________
__________________________________________________________________
3. Codominant means________________________________________________
__________________________________________________________________
4. The genotypes of individuals with the following blood types are:
type A
type B
type AB
type O
III. Gene Expression
A. Introduction
1. The same allele combination can produce different phenotypes because ______
__________________________________________________________________
2. A major goal of genomics is ________________________________________
__________________________________________________________________
B. Penetrance and Expressivity
1. Completely penetrant means ________________________________________
__________________________________________________________________
2. Incompletely penetrant means _______________________________________
__________________________________________________________________
3. A phenotype is variably expressive if _________________________________
__________________________________________________________________
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C. Pleiotropy
1. Pleiotropy is _____________________________________________________
__________________________________________________________________
2. An example of a disease that exhibits pleiotropy is _______________________
D. Genetic Heterogeneity
1. Genetic heterogeneity is ____________________________________________
__________________________________________________________________
2. An example of a condition that exhibits genetic heterogeneity is ____________
__________________________________________________________________
IV. Complex Traits
A. Monogenic means ______________________________________________________
B. Polygenic means _______________________________________________________
C. Variations in height are due to ____________________________________________
________________________________________________________________________
D. Variations in skin color are due to _________________________________________
________________________________________________________________________
E. Variations in eye color are due to __________________________________________
________________________________________________________________________
F. Complex traits are ______________________________________________________
G. Examples of complex traits are ____________________________________________
V. Matters of Sex
A. Introduction
1. A human female is termed homogametic because ________________________
__________________________________________________________________
2. A human male is termed heterogametic because _________________________
__________________________________________________________________
B. Sex Determination
1. A male is conceived when __________________________________________
__________________________________________________________________
2. A female is conceived when ________________________________________
__________________________________________________________________
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3. The gene responsible for being male is ________________________________
C. Sex Chromosomes and Their Genes
1. The X chromosome has ______________________________________ genes.
2. The Y chromosome has ______________________________________ genes.
3. The three groups of Y-linked genes are ________________________________
__________________________________________________________________
__________________________________________________________________
4. Y-linked genes are transmitted from father to ___________________________
5. Any gene on the X chromosome of a male is expressed in his phenotype because
__________________________________________________________________
6. An allele on an X chromosome of a female may or may not be expressed because
__________________________________________________________________
__________________________________________________________________
7. The male is said to be hemizygous for X-linked traits because ______________
__________________________________________________________________
8. Examples of X-linked recessive traits are ______________________________
__________________________________________________________________
9. If a mother is heterozygous for a particular X-linked gene, her son has a _____
________________________________ chance of inheriting either allele from her.
10. X-linked genes are passed on from __________________________________
11. A daughter can inherit an X-linked disorder only if ______________________
__________________________________________________________________
D. Gender Effects and Phenotypes
1. A sex-linked trait is _______________________________________________
__________________________________________________________________
2. Sex-influenced inheritance is ________________________________________
__________________________________________________________________
3. A heterozygous male is bald and a heterozygous female is not bald because ___
__________________________________________________________________
4. Genomic imprinting is _____________________________________________
__________________________________________________________________
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VII. Chromosome Disorders
A. Polyploidy
1. Polyploidy is ____________________________________________________
__________________________________________________________________
2. Polyploidy results from ____________________________________________
__________________________________________________________________
3. The fate of a polyploid human is _____________________________________
B. Aneuploidy
1. Aneuploid means _________________________________________________
2. Euploid means ___________________________________________________
3. Anueploidy results from ___________________________________________
4. Nondisjunction is _________________________________________________
__________________________________________________________________
5. Autosomal aneuploidy often results in ________________________________
__________________________________________________________________
5. Trisomy is ______________________________________________________
6. Monosomy is ____________________________________________________
7. Translocation is __________________________________________________
__________________________________________________________________
8. Trisomy 21 is known as ____________________________________________
9. Other common autosomal trisomies are _______________________________
10. Turner syndrome results from ______________________________________
11. Klinefelter syndrome results from ___________________________________
12. Jacobs syndrome results from ______________________________________
C. Prenatal Tests
1. An ultrasound can detect ___________________________________________
__________________________________________________________________
2. Amniocentesis is ______________________________________________ and
can detect _________________________________________________________
3. Chorionic villus sampling is _____________________________________ and
can detect _________________________________________________________
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4. Maternal serum markers can detect ___________________________________
__________________________________________________________________
5. Fetal cell sorting is _____________________________________________ and
can detect _________________________________________________________
VIII. Gene Therapy
A. Introduction
1. Functions of gene therapy are _______________________________________
__________________________________________________________________
2. Gene therapy operates at ___________________________________________
B. Two Approaches to Gene Therapy
1. Two basic types of gene therapy are __________________________________
__________________________________________________________________
2. Heritable gene therapy is ___________________________________________
__________________________________________________________________
3. Heritable gene therapy is most commonly performed in ___________________
4. Nonheritable gene therapy is ________________________________________
__________________________________________________________________
5. A nonheritable gene therapy for cystic fibrosis is ________________________
__________________________________________________________________
C. Tools and Targets of Gene Therapy
1. Introduction
a. Some tools of gene therapy are ________________________________
____________________________________________________________
b. The challenge in nonheritable gene therapy is _____________________
____________________________________________________________
2. Bone Marrow
a. Bone marrow tissue includes __________________________________
b. Many new gene therapy targets might be reached by bone marrow because
____________________________________________________________
____________________________________________________________
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3. Skin
a. In the laboratory, skin cells grow _______________________________
b. Skin grafts can be used to ____________________________________
____________________________________________________________
4. Muscle
a. The reasons muscle tissue is a good target for gene therapy are _______
____________________________________________________________
____________________________________________________________
b. Treatments of Duchenne muscular dystrophy are __________________
____________________________________________________________
5. Endothelium
a. Endothelium is _____________________________________________
b. Endothelium can be altered to _________________________________
____________________________________________________________
6. Liver
a. The liver is a very important focus of gene therapy because __________
____________________________________________________________
b. Liver cells that are genetically altered can relieve __________________
____________________________________________________________
7. Lungs
a. The respiratory tract is an excellent candidate for gene therapy because
____________________________________________________________
____________________________________________________________
b. A form of gene therapy used to treat emphysema is ________________
____________________________________________________________
8. Nerve Tissue
a. Gene therapy of neurons is not feasible because ___________________
____________________________________________________________
b. Routes of nerve cell gene therapy could include ___________________
____________________________________________________________
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9. Gene Therapy Against Cancer
a. Glioma is _________________________________________________
____________________________________________________________
b. A gene therapy approach for glioma is __________________________
____________________________________________________________
c. Another genetic approach to battling cancer is to __________________
____________________________________________________________
D. CODA
1. Gene discoveries have shed light on __________________________________
__________________________________________________________________
2. Gene products interact with _________________________________________
__________________________________________________________________
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