Assetion . Polytene chromosomes have a high amount of DNA.
Reason Polytene chromosomes are formed be brepeated replication of chromosomal DNA without separation of chromatids

Options

A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion.
B. It both Assertion & Reason are true but the reason is not the correct explanation of the assertion.
C. If Assertion is true statement but Reason is false.
D. It both Assertion and Reason are false statements.

Answer

a

Explanation

Polytene chromosomes are quit common in salivary glands of insects and so are called salivary chromosomes. These chromosomes have high amount of DNA of almost 1000 times in Drosophila chromosomes. Theses chromosomes are multistranded. They are in permanent prophases stage. These chromosomes are formed by somatic pairing. between homologous chromosomes and repeated replication of their chromonemata without separation of chromatids. All the chromosomes may remain attached to one another at a common point called chromocentre.