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प्रश्न
In our society the women are often blamed for giving birth to daughters. Can you explain why this is not correct?
Women are often blamed for producing female children. Consequently, they are ill-treated and ostracized. How will you address this issue scientifically if you were to conduct an awareness programme to highlight the values involved?
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उत्तर
Blaming women in our society for having girls is incorrect because the father determines the sex of the baby, not the mother. As we all know, the human female chromosome pattern is XX, while the male is XY. As a result, all haploid gametes produced by the female (ova) have the sex chromosome X, whereas male gametes (sperms) can have either X or Y; therefore, 50% of sperms carry the X chromosome, and the other 50% have the Y. Following the fusing of the male and female gametes, the zygote would bear either XX or XY depending on whether the sperm carrying X or Y fertilized the ovum. The zygote bearing XX would produce a female baby, while XY would produce a male. As a result, the baby’s sex is determined by male sperm rather than female ova.
Notes
Students should refer to the answer according to their questions.
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संबंधित प्रश्न
Define spermiogenesis.
What is oogenesis?
Explain the structure of secondary oocyte.
Explain two main process in sexual reproduction.
If one pollen grain produces two male gametes, how many pollen grains are needed to fertilize 10 ovules?
Answer the following type of question Assertion (A) and Reason (R).
(A) - In human males, testes are extra-abdominal and lie in scrotal sacs.
(R) - Scrotum acts as a thermoregulator and keeps the temperature lower by 2°C for normal sperm production.
Answer the following type of question Assertion (A) and Reason (R).
(A) - Head of the sperm consists of acrosome and mitochondria.
(R) - Acrosome contains spiral rows of mitochondria.
Which of the following occurs during maturation phase of spermatogenesis?
500 spermatozoa are formed from ____________ secondary spermatocytes.
Calculate the number of sperms and ova produced from 40 primary spermatocytes and 40 primary oocytes.
Identify the CORRECT sequence of events.
First meiotic division is observed in ____________.
How many autosomes does a human primary spermatocyte have?
Connective tissue around seminiferous tubules possess endocrine cells called ______.
How many functional sperms and how many ova will be formed by a primary spermatocyte and a primary oocyte.
At the time of organogenesis, genes regulate the process at different levels and at different time due to ______.
The process of release of spermatozoa from Sertoli cells into cavity of the seminiferous tubules is called ______.
Penetration of the sperm in the ovum is followed by ______
In the process of fertilization, this is true:
If for a species 2n = 16, then during Ist prophase and IInd prophase of the meiotic division of a cell, how many tetrads and diads will be formed:
The number of chromosome groups at the equatorial plate in metaphase-I of meiosis in a plant with 2n = 50 shall be:
Growth hormone of pituitary is more effective in ______.
In human females, meiosis II is not completed until:
Germ cells present in the seminiferous tubules undergo ______
Given below are two statements.
- Statement I: The spermatids are non-motile and non-functional which get transformed into functional spermatozoa by the process of spermiogenesis.
- Statement II: During the process of this change, the spermatids remain held to each other and to Leydig's cells by cytoplasmic bridges.
In light of the above statements, select the correct answer from the option given below.
Process of maturation and development of sperms ______.
Match List - I with List - IІ.
| List - I | List - II |
| A. Head | I. Enzymes |
| B. Middle piece | II. Sperm motility |
| C. Acrosome | ΙII. Energy |
| D. Tail | IV. Genetic material |
Choose the correct answer from the options given below:
During oogenesis the meiotic division is arrested at ______ before fertilization.
