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Principles Of Inheritance And Variation

Question
CBSEENBI12046989
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Primary source of allelic variation is

  • independent assortment

  • recombination

  • mutation

  • polyploidy

Solution

B.

recombination

Recombination is the natural process of breaking and rejoining DNA strands to produce new combination of genes and, thus, generate genetic variation. This is the phenomenon which occur during meiosis I.

Independent Assortment is one of the law of Mendel. It states thats when two or more characteristics are inherited, individual hereditary factors assort independently during gamete production, giving different traits an equal opportunity of occurring together.

Mutation is the alteration in the genetic material by physical or chemical changes.

Polyploidy is a state of a cell or organism having more than two homologous paired sets of chromosomes.

Some More Questions From Principles of Inheritance and Variation Chapter

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What is the unique feature of F1 generation ?

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

What do the symbols square and circle in a pedigree chart indicate ?

Define heterogamy. Give an example.

How many chromosomes are found in human cells ?

Why is male Drosophila regarded as heterogametic ?

What term is used for the two chromatids resulting from the interchange of segments during crossing over ?

What is name of a cross in which a dominant individual is crossed with a recessive parent?

Distinguish between homogametic and heterogametic organisms.

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