Mac 9: Start

Question 1

True or False

Chorionic Villus Sampling releases results much earlier but has a greater risk of spontaneous abortion.

Answer 1

-True

Question 2

True or False

Indirect methods that measure a characteristic that is associated with having a chromosomal abnormality are used as confirmatory tests to provide a clinical diagnosis.

Answer 2

-False (does NOT provide a clinical diagnosis)

Question 3

True or False

The 2 most common neural tube disorders are spina bifida (a brain defect) and anencephaly (a spinal cord defect).

Answer 3

-False (spina bifida is spinal cord defect & anencephaly is a brain defect)

Question 4

True or False

A human karyotype is atypical (abnormal) if the number of chromosomes in a somatic cell is NOT 46, or if individual chromosomes have extra, missing, or rearranged genetic material.

Answer 4

-True

Question 5

Match the term to its correct definition.

1. Extra chromosome sets
2. One chromosome extra
3. Chromosome with identical arms
4. Deletions in telomeres causes ends to adhere
5. Two chromosomes join long arms or exchange parts

A. Isochromosome
B. Translocation
C. Trisomy
D. Ring chromosome
E. Polyploidy

Answer 5

1. Polyploidy
2. Trisomy
3. Isochromosome
4. Ring chromosome
5. Translocation

Question 6

How many pairs of autosomes do humans have?

• 47
• 22
• 23
• 46

Answer 6

-22

Question 7

What is a chromosome composed of?

• Mostly proteins and RNA with small amounts of DNA.
• Mostly proteins and DNA with small amounts of RNA.
• Proteins, DNA and RNA
• DNA and RNA only

Answer 7

-Mostly proteins and DNA with small amounts of RNA.

Question 8

Human beings have ____ chromosomes in ____ pairs.

• 46 chromosomes in 23 pairs
• 47 chromosomes in 43 pairs
• 46 chromosomes in 22 pairs
• 47 chromosomes in 23 pairs

Answer 8

-46 chromosomes in 23 pairs

Question 9

These are found on chromosome tips and they determine the number of cell divisions left.

• Telocentric
• Telomeres
• Subtelomers
• Submetacentric

Answer 9

-Telomeres

Question 10

It remains a major clinical tool in determining chromosomal abnormalities by displaying chromosomes in pairs by size.

• Amniocentesis
• Karyotyping
• Polymerase Chain Reaction
• Chorionic Villus Sampling

Answer 10

-Karyotyping

Question 11

How many pairs of sex chromosomes do humans have?

• 22
• 1
• 23
• 2

Answer 11

-1