Chapter 4 Practice Test – EXTRA CREDIT

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Write the letter of the correct answer on the line at the left.

1) An example of a human trait that is controlled by more than one gene is

A) blood type

B) widow’s peak

C) skin color

D) dimples

2) A person who has one recessive and one dominant allele for a trait is called a

A) homozygote

B) carrier

C) clone

D) hybrid

3) A genetic disorder in which a person’s blood clots very slowly if at all is

A) sickle-cell disease

B) cystic fibrosis

C) Down syndrome

D) hemophilia

4) The crossing of two individuals that have identical or similar sets of alleles is referred to as

A) selective breeding

B) hybridization

C) inbreeding

D) cloning

5) The transfer of genes from one organism to another is called

A) hybridization

B) cloning

C) selective breeding

D) genetic engineering

6) A chart that tracts which members of a family have a particular trait is called a(n)

A) pedigree

B) Punnett square

C) karyotype

D) genome

7) The _______________ chromosome determines whether a person is a male or female

A) multiple

B) sex

C) recessive

D) gene

8) In a pedigree, a square is used to represent a

A) female

B) male

C) carrier

D) clone

9) An abnormal condition that a person inherits through genes or chromosomes is a

A) pedigree

B) gene therapy

C) genetic disorder

D) karyotype

10) People with an extra copy of chromosome 21 have a disorder called

A) Down syndrome

B) colorblindness

C) hemophilia

D) amniocentesis

Fill in the blanks to complete each statement

11) ________________ is a procedure in which fluid from around a developing baby is removed to test for genetic disorders.

12) Professionals who help couples understand their chances of having a child with a particular genetic disorder are called _____________________.

13) In ___________________, breeders cross two genetically different individuals.

14) A(n) ____________________ is an organism that is genetically identical to the organism from which it was produced.

15) Inserting working copies of a gene directly into the cells of person with a genetic disorder is referred to as _____________________.

If the statement is true write true. If it is false, change the underlined word or words to make the statement true.

_______________________ 16) Three or more forms of a gene that code for a single trait are called multiple alleles.

_______________________ 17) Sex-linked recessive traits are more common in females.

_______________________ 18) Sickle-cell disease is a genetic disorder in which the body produces abnormally thick mucus.

_______________________ 19) The process of selecting a few organisms with desired traits to serve as parents of the next generation is called genetic engineering.

_______________________ 20) In karyotyping, enzymes cut DNA into fragments, which are separated by size to form a pattern of bands.

Write an answer for each of the following in the spaces provided.

21) What is cystic fibrosis, and what causes it?

22) Why is genetic engineering sometimes called gene splicing?

23) Janice’s mother has type AB blood, and her father has type O blood. What blood type(s) could Janice have? Draw a Punnett square to explain your answer.