Name: 
 

Genetic Disorders



Completion
Complete each sentence or statement.
 

1. 

_____ are passed down from one generation to another through the _______ information stored in cells.
 

 

2. 

The ________ encoded by genes enable proteins to form, allowing an organism to function normally.
 

 

3. 

In some cases genes become damaged, or DNA is copied incorrectly. A change in the genetic material is called a ____________.
 

 

4. 

When a mutation causes harmful effects in the organism, the result is know as a ________         ___________.
 

 

5. 

Some genetic disorders are ___________ disorders.
 

 

6. 

What does recessive disorder mean in terms of how (or when) the disease will be passed on to the offspring of the organism?
 

 

7. 

If a person has only one allele for the disease, the person is a __________ of the gene but does not exhibit the disease.
 

 

8. 

Sickle-cell anemia, Tay-Sachs disease, and cystic fibrosis are examples of ___________ genetic disorders.
 

 

9. 

Some genetic disorders are _____________, which means that the genes for these diseases are carried on sex chromosomes.
 

 

10. 

If a trait is sex-linked, it usually appears only in _______.
 

 

11. 

Why does a sex-linked trait usually only appear in males?
 

 

12. 

____________ is an example of a sex-linked disease.
 

 

13. 

A genetic disorder that is __________ means that a person exhibits the disease if one allele for the disease is present.
 

 

14. 

_____________ disease (HD) is a dominant disease.
 

 

15. 

Review the chart below describing several genetic disorders.
genetic_disorders_files/i0160000.jpg
 

 

16. 

Most  genetic disorders ______ be cured.
 

 

17. 

Genetic counselors sometimes make use of a diagram called a ___________.
 

 

18. 

A pedigree traces a ______ throughout a family. Such a chart can make it possible to predict whether a person is a ___________ of a hereditary disease.
 

 

19. 

Albinism is a genetic disorder in which the body is unable to produce the _______  necessary for the production of ___________.
 

 

20. 

Melanin is a pigment that gives ______ color to hair, skin, and eyes.
 

 

21. 

Review the pedigree below. According to this pedigree, what type of trait is albinism?
genetic_disorders_files/i0220000.jpg
 

 

22. 

High-energy radiation from X-rays, ultraviolet radiation, asbestos, and the chemicals in cigarette smoke are examples of know ___________. These have been associated with causing mutations.
 

 

23. 

A genetic disorder that is __________ will appear in individuals as long as there is one allele.
 

 

24. 

A __________ disorder appears only when two alleles are present.
 

 



 
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