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प्रश्न
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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
State the exact location of the Centromere
Choose the best option out of the four alternatives a, b, c and d
Question 1:
The number of chromosomes in a certain type of cell division is halved. This kind of cell
division occurs in.
(a) Only testis
(b) Only ovary
(c) Both ovary and testis
(d) All body cells
“First meiotic division is the reduction division” what does the word ‘reduction’ refer to in this statement?
Expand the following biological abbreviations :
DNA
Choose the correct answer:
Chromosomes number is halved in ____________
Choose the correct answer:
If after karyokinesis, cytokinesis does not occur, then result would be _____________
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?
Choose the correct answer:
Thick short chromosomes can be observed at (in mitosis) ___________
Choose the correct answer:
Sex of an individual is determined by ____________
How does colchicine act as mitotic poison? Is there any advantage of it?
Differentiate between
Chromatin and Chromosome.
Name the following:
Microtubules form the bipolar spindle in which stage.
Complete the following sentence with appropriate word :
The pairing of homologous chromosomes is called _______.
Multiple Choice Question
Chromosomal aberrations are caused by:
Define euploidy.
Describe the structure of sex chromosomes with the help of labelled diagram.
Small swellings on the surface of the chromosome are called______.
The female gamete/egg cell of a human cell will have ______.
In the human male, a sperm contains autosomes and ______.
