NEET 2020 Botany Question 5 Solution
Question
In which of the following techniques, the embryos are transferred to assist those females who cannot conceive?
- (1)ZIFT and IUT
- (2)GIFT and ZIFT
- (3)ICSI and ZIFT
- (4)GIFT and ICSI
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In which of the following techniques, the embryos are transferred to assist those females who cannot conceive?
Embryo Transfer (ET) in test-tube baby programmes consists of two procedures based on blastomere count: ZIFT (Zygote Intra Fallopian Transfer, up to 8 blastomeres into Fallopian tube) and IUT (Intra Uterine Transfer, more than 8 blastomeres into Uterus). GIFT transfers GAMETES, not embryos! Mark Option (1).
When natural conception is blocked, in vitro fertilization (IVF) followed by Embryo Transfer (ET) is employed: - ZIFT (Zygote Intra-Fallopian Transfer): The zygote or early cleaving embryo containing up to 8 blastomeres is transferred directly into the ampullary-isthmic region of the Fallopian tube. - IUT (Intra-Uterine Transfer): Embryos cultured past 8 blastomeres (e.g. morula or early blastocyst stage) are transferred directly into the uterine cavity for implantation. - Both ZIFT and IUT are bona fide embryo transfer techniques designed to assist females unable to conceive naturally.
- GIFT (Gamete Intra-Fallopian Transfer): Transfer of an unfertilized ovum (gamete) collected from a donor into the fallopian tube of another female who cannot produce one, but can provide a suitable environment for fertilization. - ICSI (Intra-Cytoplasmic Sperm Injection): A laboratory micro-injection technique where a single sperm is injected directly into the cytoplasm of an ovum to achieve fertilization, not an embryo transfer protocol.
Diagnose every choice: Know exactly why the right option works and why distractors fail.
Correct. Both ZIFT (tube, ≤8 cells) and IUT (uterus, >8 cells) are the two canonical Embryo Transfer (ET) procedures.
Incorrect because GIFT transfers unfertilized gametes (ova), not embryos.
Incorrect because ICSI is an in vitro micromanipulation fertilization technique, not an embryo transfer technique.
Incorrect because neither GIFT (gamete transfer) nor ICSI (sperm injection) transfers embryos.
The first letter defines the material transferred: "G" in GIFT means GAMETE (unfertilized egg); "Z" in ZIFT means ZYGOTE/EMBRYO. Any option pairing GIFT with embryo transfer is automatically incorrect.
"In IVF-ET, embryos are transferred via ZIFT (into fallopian tube) or IUT (into uterus)."
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