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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
Give the significance of fertilization.
State whether the following statement is true (T) or false (F):
A fertilised egg becomes a seed.
State whether the following statement is true (T) or false (F):
The plumule of an embryo gives rise to the root system.
Give the appropriate term for the following:
Process of fusion of ovum and sperm.
State whether the following statement is true or false:
Gestation in humans is completed in about 380 days.
Complete the following statement by choosing the correct alternative:
Fertilization occurs in ______.
Define the following:
Ovulation
Name the female sex hormones and structures which secrete them.
Give Reasons
The acrosome of sperm secretes an enzyme called hyaluronidase at the time of fertilization
Give a labeled structure of ovum.
Explain the Term Vas deferens.
Name the Following
The basic unit of the testes.
Give Technical Term:
Rupture of the follicle and release of the ovum from the ovary.
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.
Write the functional activity of the following structure:
Seminal vesicles
Define.
Fertilization
State whether True or False:
The chromosome number in germ cells producing the gametes are diploid.
Give any four significances of fertilization in humans.
Which hormones are called neurohypophyseal hormones?
What are the functions of each hormone in the neurohypophyseal hormone?
