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प्रश्न
(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.
उत्तर
(i)See diagram.
(ii) Mitosis: two daughter cells.
Meiosis: four daughter oeils.
(iii) Chromatid: Duplicated chromosomes consist of two identical strands, each of these is called a chromatid.
Centromere: It is the point at which the two chromatids remain attached. It is also the point of attachment for spindles.
Haploid: A cell having only one set of chromosomes is called haploid.
(iv)
1. Mitosis
2. Meiosis
3. Mitosis
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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.
Answer the following question in your own words.
What is meant by ‘chromosome’?
Chromosomes are mainly made up of ______.
Choose the correct answer:
Centromere is related to ________
Choose the correct answer:
In an interphase cell chromosome are as _____________
Choose the correct answer:
Chromosomes number is halved in ____________
State how does meiosis maintains chromosome number in a species.
Give Technical Terms
The phase of meiosis at which homologous chromosomes are separated.
Multiple Choice Question:
After mitotic cell division, a female human cell will have
Give Technical Term:
Transmission of characters through generations.
Complete the following sentence with appropriate word:
The number of chromosomes in humans is ________.
With the help of a neat labelled diagram, describe the structure of chromosome.
Describe the structure of sex chromosomes with the help of labelled diagram.
The region of the chromosome where the spindle fibres get attached during cell division ______
The number of chromosomes found in human beings is ______.
Identify the TRUE statements with respect to aneuploidy.
- When the chromosome number is not the exact multiple of the haploid set, it is described as aneuploidy.
- Aneuploidy is only addition of one or more chromosome(s) to the total number of chromosomes in a cell.
- Aneuploidy is further classified as hypoploidy and hyperploidy.
Generally, the recessive character is expressed only when present in a double recessive condition i.e. homozygous condition. However, a single recessive gene can express itself in human beings when the gene is present on ______
