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प्रश्न
उत्तर
Chromosomes are the thread like structures present in the nucleus of the cell. They are covered with a sheath made up of proteins and filled with granular matter called matrix. Inside the matrix, there are two threads called chromonemata.
The chromosome consists of two symmetrical strands called chromatids. Each chromosome consists of a distinct constriction called centromere which gets attached to the spindle network.
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संबंधित प्रश्न
Expand the following biological abbreviations :
DNA
Chromosomes are mainly made up of ______.
Choose the correct answer:
Chromosomes appear at equator in ____________
Choose the correct answer:
Centromere is related to _______________
Choose the correct answer:
Chromosome is most coiled at (in mitosis) ________________
Choose the correct answer:
The term 'chromosome' was coined by ___________
What is the importance of meiosis?
(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.
Explain the Term Zygotene
Give Technical Terms
The stage at which chromosomes occurs reach the opposite poles.
Duplicated chromosomes are joined at a point termed ______.
Name the following:
The diploid number for cell of man.
Name the following:
A specific part of a chromosome that determine hereditary characteristics.
Multiple Choice Question
Chromosomal aberrations are caused by:
With the help of a neat labelled diagram, describe the structure of chromosome.
Which of the following type of chromosomes has only one telomere?
Define Aneuploidy.
Define the following term:
Chromatid
