Answer:
-"Conception usually occurs when the ovum is in the outer third of the fallopian tube."
Step-by-step explanation:
Conception is the process of fertilization of ovum and sperm forming a zygote. The sperm cells from male determines the sex of the fetus. An ovum carries an X chromosome, whereas, the sperm may carry either X or Y chromosome. If an X chromosome fertilizes with the ovum, a female child is born and if a Y chromosome fertilizes with the ovum, a male child is born. Conception occurs when the ovum is in the outer third of Fallopian tube and aids the fusion with sperms coming up into the Fallopian tube.