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प्रश्न
What would be the effect if meiosis did not occur in nature?
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
Name the following:
The accessory gland in human males whose secretion activates the sperms
Differentiate between the following pair:
Efferent duct and sperm duct
Rewrite the terms in the correct order so as to be in a logical sequence.
coitus, ovum, Sperm, sperm duct, urethra, Vagina.
Give the appropriate term for the following:
Process of fusion of ovum and sperm.
State whether the following statement is true or false:
Fertilization occurs in the vagina.
Give appropriate term of the following:
The attachment of developing zygote (blastocyst) on the uterine wall.
Name the following:
Organ producing sperms.
Define the following:
Spermatogenesis
Write in sequence the regions in which a mature sperm travels from the seminiferous tubules up to the urethral opening?
Name two essential structures which take part in fertilization.
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.
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.
Write the functional activity of the following structure:
Prostate gland
Multiple choice question.
In human female, the fertilized egg gets implanted in uterus _______.
Answer the following question.
What is capacitation? Give its importance.
Define.
Fertilization
What is sex chromosomes?
Give any four significances of fertilization in humans.
Choose the odd one out from the group of terms given below and write the category for the remaining terms:
