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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
State whether the following statement is true (T) or false (F):
A fertilised egg becomes a seed.
State whether the following statement is true or false:
Fertilization occurs in the vagina.
Name the following:
Virgin birth
Where does fertilization occur?
Give Reasons
Millions of sperms are produced at ejaculation yet one sperm actually fertilizes the ovum. Explain.
Give Technical Term:
In how many weeks fetus development is completed?
Complete the following sentences with appropriate word:
Fertilization of the human egg by the sperm normally occurs in the_______
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:
Fertilization means:
Write a short note on fallopian tube.
Which parts are converted into Seed and fruit respectively after fertilization?
Give scientific reason.
The new individual produced by sexual reproduction always has the recombined genes of both the parents.
What is fertilization?
What are the functions of each hormone in the neurohypophyseal hormone?
During copulation, approximately how much semen containing how many spermatozoa is deposited in the vagina?
What is the duration of capacitation in the female genital tract?
Which enzyme dissolves the hyaluronic acid between corona radiata cells and the zona pellucida?
Which enzyme digests a localized hole in the zona pellucida to allow sperm entry?
What are the two sequential blocks that prevent polyspermy?
