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प्रश्न
Explain the types of chromosomes on the basis of position of centromere.
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उत्तर
Chromosomes can be classified into four types on the basis of position of centromere:
a. Metacentric:
Centromere is in the middle of the chromosome and hence, the two arms are nearly equal.
Chromosome looks ‘V’-shaped in anaphase.
b. Submetacentric:
Centromere is not in the center but some distance away from the centre of
chromosomes and therefore arms are unequal in length.
The chromosome appears ‘L’ shaped in anaphase.
c. Acrocentric:
Centromere is near one end of the chromosome. One arm is very short, while other is long.
d. Telocentric:
Centromere is at the extreme tip of the chromosome.
The arm is only on one side.
Chromosome remains rod shaped even in anaphase.
Chromosome appears ‘i’ shaped.
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संबंधित प्रश्न
If the number of chromosomes in an endosperm cell is 27, what will be the chromosome number in the definitive nucleus?
- 9
- 18
- 27
- 36
Who had proposed the chromosomal theory of inheritance?
Classify the chromosomes on the basis of position of centromere.
Give an account of artificial chromosomes in the transfer of genetic material.
Telocentric chromosome differs from acrocentric chromosome in that ____________.
During cell division, spindle fibres get attached to the disc shaped structures present on the centromere are known as ______.
Chromosome maps/genetic maps were first prepared by ______.
How many types of gametes would be produced if the genotype of a parent is AaBB?
How do genes and chromosomes share similarity from the point of view of genetical studies?
Which of the following sentences are correct?
1. The offspring exhibit only parental combinations due to incomplete linkage
2. The linked genes exhibit some crossing over in complete linkage
3. The separation of two linked genes are possible in incomplete linkage
4. Crossing over is absent in complete linkage
