Practice Quiz for Common Abnormalities

No. of Questions= 7

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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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