SPECIAL TYPES OF CHROMOSOMES Flashcards
1
Q
What are the special types of chromosomes ?
A
Giant chromosome
- Lamp brush chromosomes
- Polytene chromosomes
2
Q
What are lamp brush chromosomes ?
A
- First reported by “Ruckard” in salamander oocyte.
- Also reported in oocyte of the vertebrates and the invertebrates.
- Have two chromosomal axis
- Each chromosomal axis , lateral loops arises DNA
3
Q
What are lamp brush chromosomes also known as ?
A
DIPLOTENE BIUALENT (also called dictyotene stage) and are joined at chiasmata.
4
Q
LEARN THE DIAGRAM OF LAMPBRUSH CHROMOSOME
A
DONE :D
5
Q
What are polytene chromosome ?
A
They were first seen by EG balbiani in the salivary gland of chironomous insect {a variety of drosophila}
Salivary gland chromosome which undergo repeated endomitosis without the division of centrosome(at least 10 times).
6
Q
LEARN POLYTENE CHROMOSOME FROM NOTES
A
DONE :D
7
Q
What is function of balbiani’s rings ?
A
Also known as chromosomal puff.
They are site for the synthesis of the proteins and mRNA
