Question

In vitro fertilization and, in some instances, gamete intrafallopian transfer include ________.

a.

fertilization of the egg in the laboratory

b.

fertilization of the egg in the oviducts

c.

placement of sperm into the female organ

d.

injection of sperm into the egg

Answer 1

IVF or invitro fetrilization required the fetrilization of egg in th elaboratory and thereafter, th efertilized eggs are implanted into the uterus. In gamete intrafallopian transfer (GIFT), the eggs are retrieved from the ovaried and mixed with sperms in a catheter followed by the laparoscopic implantation of the mixture of egg and sperms into the fallopian tube where fertilization proceeds naturally (invivo).

Therefore, option (a) and option (b) are exclusive to the respective techniques. Option (c) is not common to IVF.

Finally, option (d) is correct since, during IVF the sperm is injected into the gg cell follwed by its fetilization in laboratory. On the other hand, during GIFT, the sperm and egg mixture are together injected into the fallopian tubes. Also in GIFT, by injecting a single sperm directly into an oocyte, multiple barriers of fertilization are bypassed and success rates (when compared to standard IVF) are greatly improved.

Therefore, option (d) is common to both the techniques.