When explaining twin conception, the nurse points out that dizygotic twins develop from
a. A single fertilized ovum and are always of the same sex
b. A single fertilized ovum and may be the same sex or different sexes
c. Two fertilized ova and are the same sex
d. Two fertilized ova and may be the same sex or different sexes
D
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A A single fertilized ovum that produces twins is called monozygotic.
B Monozygotic twins are always the same sex.
C Dizygotic twins are from two fertilized ova and may or may not be the same sex.
D Dizygotic twins are two different zygotes, each conceived from a single ovum
and a single sperm. They may be both male, both female, or one male and one
female.
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One advantage of health-risk appraisal instruments is that
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