The school nurse is presenting a lecture to adolescents to teach them how conception occurs. Which of the following statements by the nurse would accurately describe this process?
A) "Human life begins with the union of two cells: the zygote and the sperm."
B) "At the time of conception, the ovum determines the sex of the baby."
C) "Conception usually occurs when the ovum is in the outer third of the fallopian tube."
D) "The ovum carries the Y chromosome and the sperm carries an X or Y chromosome."
C
Feedback:
Conception usually occurs when the ovum is in the outer third of the fallopian tube (oviduct). Human life (conception) begins with the union of two cells: the ovum (female) and the sperm (male). At the time of conception, the sperm determines the sex. An ovum carries only one type of chromosome to determine sex: the X chromosome. A male sperm cell may carry either an X or Y sex chromosome. If a sperm cell carrying a Y chromosome fertilizes the ovum, a boy (XY) will result; if the sperm cell carries an X chromosome, the result will be a girl (XX).
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