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प्रश्न
Label the lettered parts of the given figure and answer the following questions:
(i) What does this diagram represent?
(ii) What is the importance of'd'?
(iii) What are the 'staining' properties of 'b' and 'c'?
(iv) Who gave the term used for this structure today?
(v) What is a?
(vi) Is 'e' present in all chromosomes?
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उत्तर
(i) This diagram represents the structure of chromosome.
(ii) 'd' is centromere which gets attached to the spindle fibres.
(iii) 'b' is heterochromatin which is darkly stained region when stained with acetocarmine and 'c' is euchromatin which when stained with acetocarmine or felugen gets lightly stained.
(iv) Waldeyer
(v) Matrix
(vi) No, secondary constriction or 'e' is not present in all chromosomes.
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संबंधित प्रश्न
What is the number of chromosomes in the gametes of human beings?
“First meiotic division is the reduction division” what does the word ‘reduction’ refer to in this statement?
Write a sentence of the following:
Telomere
The number of chromosomes in a certain type of cell division is halved. This kind of cell division occurs in ______.
Enumerate the various changes that occur in the nucleus of the cell during anaphase of mitotic division.
State how does meiosis maintains chromosome number in a species.
Name the following:
Microtubules form the bipolar spindle in which stage.
Give Technical Terms
The stage when sister chromosomes separate from their paired condition.
Give Technical Terms
The stage at which the formation of chiasmata occurs.
Give Technical Terms
The phase of meiosis at which homologous chromosomes are separated.
Complete the following sentence with appropriate word :
Chromosomes are _________ material.
State the Location: Polytene chromosome
Name the following:
The pattern of arrangement of genes along a chromosome.
Long answer type question.
Describe the different types of chromosomes.
Define euploidy.
The sex of the newborn child is a matter of chance and neither of the parents may be considered responsible for it. What would be the possible fusion of gametes to determine the sex of the child?
Which of the following is TRUE with respect to the genes which inherit together during crossing over?
Define the following term:
Chromosome
Rewrite the correct form of the statement by changing the first or last word only:
Duplicated chromosomes remain attached at a point termed as centrosome.
