Lab #18 Chromosomal Screening

Question 1

What are Karyotypes used for?

Clinical diagnoses of chromosomal disorders

Identification of chromosomal abnormalities leading to cancers

To reveal the effects of environmental toxins

Provide evidence of evolutionary relationships

All of these are correct

Answer 1

All of these are correct

Question 2

A medical procedure in which a sample of fetal cells is removed from the fluid in a pregnant woman’s uterus and then studied is called ______________.

Karyotyping

Amniocentesis

Chorionic villus sampling (CVS)

Fluorescence in situ hybridization (FISH)

Answer 2

Amniocentesis

Question 3

Chromosome isolation and microscopic observation forms the basis of ________________ and is the primary method by which clinicians detect chromosomal abnormalities in humans.

Cytogenetics

Population genetics

Ontogenetic

Genomics

Answer 3

Cytogenetics

Question 4

An incorrect number of cellular chromosomes that occur when homologous chromosome pairs or sister chromatids fail to separate during meiosis is called _________________.

Nondisjunction

Mutation

Amniocentesis

Barr body inactivation

Answer 4

Nondisjunction

Question 5

Which of the following statements about nondisjunction is true.

Nondisjunction only results in gametes with n+d or n-1 chromosomes.

Nondisjunction occurring during meiosis II results in 50 percent normal gametes.

Nondisjunction during meiosis I result in 50 percent normal gametes.

Nondisjunction always results in four different kinds of gametes.

Answer 5

Nondisjunction occurring during meiosis II results in 50 percent normal gametes.

Question 6

What is Down syndrome?

Answer 6

Trisomy 21 (three copies of chromosome 21)

Question 7

What is triplo-X?

Answer 7

XXX (three copies of the X chromosome)

Question 8

What is Klinefelter syndrome?

Answer 8

XXY (male with an extra copy of the X chromosome)

Question 9

What is Turner syndrome?

Answer 9

XO (female missing one copy of the X chromosome)

Question 10

What is Edward’s syndrome?

Answer 10

Trisomy 18 (three copies of chromosome 18)

Question 11

A technique used to attach molecules to chromosomes that produce a flash of colored light is known as ________________.

Karyotyping

Amniocentesis

Chorionic villus sampling (CVS)

Fluorescence in situ hybridization (FISH)

Answer 11

Fluorescence in situ hybridization (FISH)