Assertion (A) : Gene pairs present on the same chromosome may be tightly linked or loosely linked. Reason (R) : Frequency of recombination between gene pairs on different chromosomes as a measure of the distance between genes can be used for 'mapping' their position on the chromosomes.

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Assertion-ReasonLinkage and Crossing Over in ChromosomesCBSE PYQ

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Assertion (A) : In dihybrid crosses involving sex-linked genes in Drosophila generation of non-parental gene combinations are observed. Reason (R) : Two genes present on different chromosomes show linkage and recombination in Drosophila.

Assertion-ReasonLinkage and Crossing Over in Chromosomes

Assertion (A) : When the two genes in a dihybrid cross are situated on the same chromosome, the proportion of parental gene combinations is much higher than non-parental type. Reason (R) : Higher parental gene combinations can be attributed to crossing over between two genes.

Assertion-ReasonLinkage and Crossing Over in Chromosomes