Practice Quiz for Common Abnormalities

No. of Questions= 7

INSTRUCTIONS: To answer a question, click the button in front of your choice. A response will appear in the window below the question to let you know if you are correct. Be sure to read the feedback. It is designed to help you learn the material. You can also learn by reading the feedback for incorrect answers.

1 It is likely that as many as __________ newborn infants inherits a chromosomal abnormality.
a)  1 in 5
b)  1 in 57
c)  1 in 118
d)  1 in 100,000
 
2 There are two major categories of inherited chromosomal abnormalities: 1) irregular numbers of chromosomes and 2) structural modification in a chromosome. Both are usually a result of:
a) mechanical errors during meiosis
b) mechanical errors during mitosis
c) neither of the above
3 If a child had a karyotype that had 23 + 23 + 23 chromosomes or 23 + 24, it would be:
a) within the range of normal
b) an irregular number of chromosomes
c) a structural modification in the chromosomes
4 A structural modification of a chromosome might be:
a) a break in a chromatid arm and its separation from its chromosome
b) a miscarriage or spontaneous abortion
c) a karyotype
5 What can cause a gross chromosomal modification?
a) masturbation
b) excessive frequency of sexual intercourse
c) environmental agents such as radiation
6 Inherited chromosomal abnormalities usually result from:
a) defective sperm or ova
b) a failure of the mother's uterus and placenta in carrying a fetus to full term
c) inadequate nutrition and medical care during early infancy
7 When only some of an individual's cells have a chromosomal abnormality, it is referred to as ________________ .
a) crossing-over
b) mosaicism
c) nondisjunction

 


 


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