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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 are genes?
Given below is a schematic diagram of a portion of DNA.
- How many strands are shown in the diagram?
- How many nucleotides have been shown in each strand?
- Name the parts numbered 1, 2, 3, 4 and 5 respectively.
- Name the DNA unit constituted by the parts 1, 2, 3 collectively.
“First meiotic division is the reduction division” what does the word ‘reduction’ refer to in this statement?
Mention whether the following statement is (T) Or (F). Give reason in support of your answer.
The unfertilized human egg has half the number of chromosomes of the body cells.
Mention the contribution of the scientist given below in the study of chromosome:
Sutton and Boveri
Choose the correct answer:
Chromosomes largely consist of _______________
Choose the correct answer:
A 'V' shaped chromosomes has to _____________
Enumerate the various changes that occur in the nucleus of the cell during prophase.
Enumerate the various changes that occur in the nucleus of the cell during anaphase of mitotic division.
Name the following:
Microtubules form the bipolar spindle in which stage.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
Chromosomes other than sex-chromosomes are autonomous.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
Chromosomes are the thickest and shortest in telophase.
State the Location: Chromosomes
Write the functional activity of the following structure:
Spindle fibers
Complete the following sentence with appropriate word:
The chromosomal theory of inheritance was proposed by ____________in 1902.
Identify the odd one:-
Explain the structure of a chromosome.
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?
Define Aneuploidy.
