Arrange the following steps of in vitro fertilisation followed by embryo transfer (IVF-ET) in the correct order:
A. The zygote or early embryo is transferred into the fallopian tube.
B. Ova from the wife/donor and sperms from the husband/donor are collected.
C. The gametes are induced to form a zygote under simulated conditions in the laboratory.
D. The embryo completes its further development in the female.
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → B, C, A, D
IVF followed by embryo transfer (IVF-ET) is the test tube baby programme. The gametes are collected first. They are made to form a zygote in the laboratory. The zygote or early embryo is then placed in the fallopian tube, where it completes its further development.
B. Ova from the wife or a donor and sperms from the husband or a donor are collected.
C. The gametes are induced to form a zygote under simulated conditions in the laboratory.
A. The zygote or early embryo is transferred into the fallopian tube (ZIFT).
D. The embryo completes its further development in the female.
So the correct order is B, C, A, D.
NCERT Extract:
Infertility – “… In this method, popularly known as test tube baby programme, ova from the wife/donor (female) and sperms from the husband/donor (male) are collected and are induced to form zygote under simulated conditions in the laboratory. The zygote or early embryos (with upto 8 blastomeres) could then be transferred into the fallopian tube (ZIFT–zygote intra fallopian transfer) and embryos with more than 8 blastomeres, into the uterus (IUT – intra uterine transfer), to complete its further development.”