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प्रश्न
What would be the effect if meiosis did not occur in nature?
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उत्तर
- During meiosis, reduction division produces four haploid cells (gametes i.e. human sperm cell and egg cell) from a single diploid cell. Hence, if meiosis does not occur, it will result in a doubling of chromosomes in each successive generation, which will result in the formation of abnormalities.
- If meiosis does not occur, the chromosome number of parents and their offsprings will differ in every generation, hence no species will hold its characters.
- Also, there will be no crossing over of homologous chromosomes. Thus, there will be no variations with respect to the changing environment in progeny to maintain their existence, which may lead to the extinction of species.
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संबंधित प्रश्न
Define the Zygote.
Name the following:
The accessory gland in human males whose secretion activates the sperms
The middle piece of sperm provides:
The diagram given below is that of a developing human foetus in the womb. Study the same and answer the question that follow:
What term is given to the period of development of the foetus in the womb?
The figure given below represents the female reproductive system of a mammal.
What will happen if the part B on both sides gets blocked?
Write in sequence the regions in which a mature sperm travels from the seminiferous tubules up to the urethral opening?
What is fertilization? Name the site of fertilization in the human females.
Give Reasons
Gametes have a haploid (n) number of chromosomes.
Give Reasons
The oviduct funnel is lined with cilia.
Give Technical Term:
In how many weeks fetus development is completed?
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
Sperm is a highly motile male gamete.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
The process of fusion of the sperm nucleus and the egg nucleus is termed implantation.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
Fertilization is the product of the egg nucleus and the sperm nucleus.
Describe the process of fertilization.
Explain the mechanism of fertilization in humans.
Explain the process of fertilization.
Which of the following is the first cell of human life?
State whether the following statement is True or False. If false, correct the statement:
The eggs of fish are covered by hard shells for protection.
State whether True or False:
The chromosome number in germ cells producing the gametes are diploid.
Name the three main regions of the human sperm, and briefly mention the function of each.
