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प्रश्न
Explain the Term Spindle
उत्तर
Spindle: A fanlike micròthbule structure that helps separate the chromosomes.
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संबंधित प्रश्न
Synthesis phase in the cell cycle is called so, because of the synthesis of more:
A. RNA
B. RNA and proteins
C. DNA
D. Glucose
State the exact location of the Centromere
“First meiotic division is the reduction division” what does the word ‘reduction’ refer to in this statement?
Choose the correct answer:
Chromosomes number is halved in _____________
Choose the correct answer:
Minimum coiling in chromosome is at ______________
Choose the correct answer:
Chromosome is most coiled at (in mitosis) ____________
Write a sentence of the following:
Sheath
Why gametes have a haploid number of chromosomes?
(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 Chromosomes
Name the following:
The pattern of arrangement of genes along a chromosome.
Complete the following sentence with appropriate word:
The chromosomal theory of inheritance was proposed by ____________in 1902.
Multiple Choice Question
Chromosomal aberrations are caused by:
Long answer type question.
Describe the different types of chromosomes.
In humans, the sex chromosome complement is
Describe the structure of sex chromosomes with the help of labelled diagram.
The centromere is found at the centre of the ______ chromosome.
The loss of one or more chromosomes in ploidy is called ______.
Match the following.
| 1. Autosomes | - | Trisomy 21 |
| 2. Diploid condition | - | 9 : 3 : 3 : 1 |
| 3. Allosome | - | 22 pair of chromosome |
| 4. Down’s syndrome | - | 2n |
| 5. Dihybrid ratio | - | 23rd pair of chromosome |
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 ______
