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प्रश्न
Long answer type question.
Describe the different types of chromosomes.
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उत्तर
Following are the four types of chromosomes with respect to the position of the centromere: Acrocentric (j shaped), Telocentric (i shaped), Sub-metacentric (L shaped) and Metacentric (V-shaped).
| Type of chromosome | Name of chromosome | Position of centromere |
 |
Metacentric | Middle of the chromosome |
 |
Sub-metacentric | Some distance away from the centre of chromosomes |
 |
Acrocentric | Near one end of the chromosome |
 |
Telocentric | At one end |
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संबंधित प्रश्न
State the exact location of the Centromere
Name the sex chromosomes in human males and females
The term “chromosomes” literally means ______.
Give Technical Terms
The stage at which synapsis in chromosomes to form bivalents.
Complete the following sentence with appropriate word :
The pairing of homologous chromosomes is called _______.
The region of the chromosome where the spindle fibres get attached during cell division ______
Identify the TRUE statements with respect to aneuploidy.
- When the chromosome number is not the exact multiple of the haploid set, it is described as aneuploidy.
- Aneuploidy is only addition of one or more chromosome(s) to the total number of chromosomes in a cell.
- Aneuploidy is further classified as hypoploidy and hyperploidy.
In higher unisexual animals, one pair of chromosomes is not identical in two sexes. It is called as ______.
Differentiate between X-chromosome and Y-chromosome with reference to –
- length of non-homologous regions
- type as per the position of the centromere
Which of the following statements are correct?
- X chromosome has large amount of euchromatin.
- heterochromatin is genetically inert.
- Both X and Y chromosomes are homologous.
- Crossing over does not take place in sex chromosomes in female.
Choose the correct option.
