Video Transcript
The process of creating test-tube
babies is more commonly known as in vitro fertilization. Put the following steps of a
standard in vitro fertilization procedure in the correct order. (A) Fertilization of the eggs by
sperm. (B) Egg retrieval and semen
collection. (C) Embryo transfer into the
uterus. (D) Embryo development up to the
blastocyst stage in a nutritive medium. (E) Ovarian stimulation to
stimulate egg production. (A) A, B, D, C, E; (B) B, A, E, D,
C; (C) E, B, A, C, D; (D) B, E, A, D, C; (E) E, B, A, D, C.
To answer this question, let’s go
over the steps involved in in vitro fertilization, or IVF. First, let’s remove these answer
choices so we have more room to work with.
The first step of IVF is ovarian
stimulation. Here, medication is taken to cause
multiple follicles to develop, each containing an egg. These follicles grow until the eggs
are mature. In the next step, the eggs are
retrieved. The follicles are drained with a
long needle in an IVF clinic. In addition, during this step, the
semen that contains the sperm is collected by ejaculation. In the next step, the sperm and
eggs are combined in a special nutritive liquid medium in a Petri dish. Here, the sperm can fertilize the
egg to form an embryo. Now, the embryo can develop in this
nutritive medium until it becomes a blastocyst. In the final step, the embryo can
be transferred into the uterus, where it may implant and form a pregnancy.
Now that we’ve outlined each step,
let’s bring back the answer choices to choose the answer that correctly identifies
these steps in IVF. The correct answer is (E) E, B, A,
D, C.
