Assertion: Polytene chromosomes have a high amount of DNA.
Reason: Polytene chromosomes are formed by repeated replication of chromosomal DNA without separation of chromatids.

If both assertion and reason are true and reason is the correct explanation of assertion

If both assertion and reason are true but reason is not the correct explanation of assertion

If assertion is true but reason is false

If both assertion and reason are false.

Solution

If both assertion and reason are true and reason is the correct explanation of assertion

Polytene chromosomes are quite common in salivary glands of insects and so are called salivary chromosomes. These chromosomes have high amount of DNA of almost I 000 times in Drosophila as compared to ordinary somatic chromosomes. These chromosomes are multistranded. They are in permanent prophase stage. These chromosomes& are formed by somatic pairing between homologous chromosomes and repeated replication pf their chromonemata without separation of chromatids. All the chromosomes may remain attached to one another at a common point called chromocentre.

Some More Questions From Principles of Inheritance and Variation Chapter

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Principles Of Inheritance And Variation

Some More Questions From Principles of Inheritance and Variation Chapter

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What will be the genetic make up of an organism which suffers from sickle cell anaemia ?

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