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प्रश्न
Trace the events from copulation to zygote formation in a human female.
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उत्तर
- When coitus (copulation) occurs, the penis releases semen into the vagina (insemination).
- The motile sperms travel quickly past the cervix, penetrate the uterus, and finally reach the fallopian tube's ampullary area.
- The ovary's ovum is also transferred to the ampullary area, where fertilisation occurs.
- Fertilisation can take place only if the ovum and sperms are transferred to the ampullary region at the same time. This is why not all copulations result in fertilisation and pregnancy.
- The process of fusion of a sperm with an ovum is called fertilisation.
- During fertilisation, a sperm comes into contact with the ovum's zona pellucida layer, causing alterations in the membrane that prevent further sperm from entering. As a result, only one sperm can fertilise an ovum.
- The acrosome's secretions aid sperm entry into the cytoplasm of the ovum via the zona pellucida and plasma membrane.
- This causes the secondary oocyte's meiotic division to be completed.
- The second meiotic division is also uneven, producing a second polar body and a haploid ovum (ootid).
- Soon, a diploid zygote is created when the haploid nuclei of the sperm and the ovum fuse together.
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संबंधित प्रश्न
Multiple choice question.
Test tube baby technique is called _______.
Fill in the blank:
The primary sex organ in human male is _______.
Fill in the blank:
The disc-like structure which helps in the transfer of substances to and from the fetus’s body is called _______.
Explain any three methods that can be used to overcome infertility.
Expand the following.
ZIFT
Which of the following is ART?
What is correct for test tube baby?
Mention the primary aim of the “Assisted Reproductive Technology” (ART) programme.
Given below are Column A with a list of certain Assisted Reproductive Technologies (ART) and in Column B the procedures followed during ART:
| Column A | Column B | ||
| S. No. | Names of ART | S. No. | Procedures |
| (A) | GIFT | (i) | Transfer of ovum from a donor into the fallopian tube of another female. |
| (B) | ICSI | (ii) | Transfer of semen from the donor into the vagina of the female. |
| (C) | ZIFT | (iii) | Injecting sperm directly into the ovum. |
| (D) | IUI | (iv) | Transfer of early embryos into the fallopian tube. |
Choose the option where ART correctly matches with the procedure.
The ______ is also called the womb.
