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  4. A. The physical association between the two genes is termed as (a) . B. The generation of non-parental gene combination is termed as (b) .

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Q. A. The physical association between the two genes is termed as $(a)$ ____ .
B. The generation of non-parental gene combination is termed as $(b)$____ .

NTA AbhyasNTA Abhyas 2020Principles of Inheritance and Variation

Solution:

Linkage: It is the tendency of genes to remain together even during the formation of gametes. This is due to the physical association or linkage between the $2$ genes. In such cases, parental gene combinations remain higher than the non-parental gene combinations (recombinants).
Recombination: It is the tendency of the generation of non-parental gene combinations. In such cases, non-parental gene combinations (recombinants) remain higher than the parental gene combinations.