Name:

GGeenneettiiccss UUnniitt -- TTeesstt RReevviieeww

This test will cover genetics, genetic disorders, and chromosomal disorders. First and foremost, study the

notes given in class! Second, look over the two quizzes on genetics. Review the worksheets covering

incomplete dominance (spongebob), codominance (blood typing), and sex-linked traits. Just because

something is not on the review guide does not mean that it will not be on the test.

1. Describe Mendel’s work. You should know what he worked with and what he discovered.

2. List Mendel’s 3 Laws of Inheritance:

1)

2)

3)

3. Solve the following types of genetic problems:

1 trait crosses involving a dominant and a recessive gene.

(Tt X Tt) T=Tall t=short

Genotypic Ratio=

Phenotypic Ratio=

2 trait crosses involving 2 dominant and 2 recessive genes.

(TtGg X TtGg) T=Tall t=Short

G=Green g=yellow

Genotypic Ratio=

Phenotypic Ratio=

1 trait cross that is sex-linked. (in this case, pretend that the disorder is caused by a recessive allele)

(XHX

h X X

HY)

Describe the possible offspring:

A cross involving 2 genes that are codominant.

(IAi X I

Bi) also known as AO blood crossed with BO blood.

List all of the possible genotypes:

List all of the possible phenotypes:

4. Which individuals are:

Male:

Female:

Carriers:

Affected:

5. What is a karyotype and identify some of the problems that can be identified by a karyotype.

6. Explain how an autosomal trait is different from a sex-linked trait and provide examples of each.

7. Define the following terms:

Trait:

Pure-bred:

Hybrid:

Homozygous:

Heterozygous:

Dominant Trait:

Recessive Trait:

Alleles:

I

II

III

1 2 3 4

1 2 3 4 5 6

1 2

Genotype:

Phenotype:

Monohybrid Cross:

Dihybrid Cross:

Codominance:

Incomplete Dominance:

Sex Chromosome:

Autosome:

8. What is nondisjunction?

9. How is an autosomal dominant disorder different from an autosomal recessive disorder?

Provide some examples of each:

10. Match the description with the disorder:

___ An extra chromosome #21

___ Fatal, involves the deterioration

of the brain.

___ XYY “supermale”

___ A disorder that causes red blood cells

to be an abnormal shape.

___ Excessive production of mucous

___ Death within the first few months or

years of life due to an overproduction

of lipids in the brain.

___ Individuals with only one X and no

other sex chromosomes.

___ Individuals with XXY

___ Cry like a cat, missing part of chromosome #5

___ Causes excessive bleeding

___ Trisomy on #21

A. Turner Syndrome

B. Jacob Syndrome

C. Sickle Cell Anemia

D. Huntingdon’s Disease

E. Tay-Sachs Disease

F. Hemophilia

G. Down Syndrome

H. Cystic Fibrosis

I. Down Syndrome

J. Klinefelter Syndrome

K. Cri-du-Chat Syndrome