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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
Differentiate between the following pair:
Efferent duct and sperm duct
The middle piece of sperm provides:
Differentiate between:
Semen and sperm
What happens to uterus if fertilization takes place? And what happens to uterus if fertilization does not take place?
Give the functions of the following:
Fallopian tube
The following diagram represents the vertical sectional view of the human female reproductive system.
What happens to the uterus, if fertilization fails to take place?
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?
Give Reasons
Millions of sperms are produced at ejaculation yet one sperm actually fertilizes the ovum. Explain.
Explain the term Cowper’s glands.
Give Technical Term:
How much semen is discharged per ejaculation in a man?
Give Technical Term:
What term is used for the production and maturation of sperms in the testes?
Complete the following sentences with appropriate word:
The process of releasing an egg from the ovary is called _________.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
Vas deferens transports sperms into the urethra.
Multiple Choice Question:
Ovulation in mammals is a process in which
How can plants and animals save themselves from extinction?
Explain the process of fertilization.
The enzyme involved in penetration of sperm into ovum is ______.
State whether True or False:
The chromosome number in germ cells producing the gametes are diploid.
What are the functions of each hormone in the neurohypophyseal hormone?
