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प्रश्न
Give a reason for the following:
Gametes must be produced by meiosis for sexual reproduction.
उत्तर
Meiosis is a type of cell division that reduces the chromosome number by half, necessitating the production of gametes for sexual reproduction. Gametes are haploid cells, which means that they contain half the number of chromosomes present in diploid cells (such as somatic cells). During fertilisation, the resulting zygote has the full diploid chromosome number when two gametes (sperm and egg) with half the chromosome number each fuse. Variation in the population is a result of the genetic diversity that is necessary for progeny to inherit a distinctive combination of genetic material from both parents.
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संबंधित प्रश्न
Name the following:
The number of chromosomes present in a nerve cell of a human being.
Humans have 46 chromosomes. Their sperms and eggs will have ______ chromosomes each.
Choose the correct answer:
During mitosis which of the following disintegrate ___________
Choose the correct answer:
Chromosome is most coiled at (in mitosis) ________________
Choose the correct answer:
Chromosome number of man is _____________
The number of chromosomes in a certain type of cell division is halved. This kind of cell division occurs in ______.
What are chromosomes?
Enumerate the various changes that occur in the nucleus of the cell during anaphase of mitotic division.
(i) Draw a neat labeled diagram to show the metaphase stage of mitosis in an animal cell having ‘6’ chromosome.
(ii) How many daughter cells are formed at the end of mitosis and at the end of meiosis?
(iii) With reference to cell division explain the following terms:
(Chromatid, Centromere, Haploid).
(iv) Name the type of cell division that occurs during:
1. Growth of shoot 2. Formation of pollen grains.
3. Repair of worn out tissues.
Give Technical Terms
The stage at which the formation of chiasmata occurs.
Multiple Choice Question:
How many chromosomes are found in a cell of humans?
Complete the following sentence with appropriate word:
The chromosomal theory of inheritance was proposed by ____________in 1902.
The number of chromosomes found in human beings is ______.
The loss of one or more chromosomes in ploidy is called ______.
The thin thread-like structures found in the nucleus of each cell are called ______.
Which of the following type of chromosomes has only one telomere?
The female gamete/egg cell of a human cell will have ______.
Given below is a set of four term. Choose the odd one and write the category of the remaining term:
