Select the correct statement from the ones given below with respect to dihybrid cross.

  • Option 1)

    Tightly linked genes on the same chromosome show higher recombination

  • Option 2)

    Genes far apart on the same chromosome show very few recombinations

  • Option 3)

    Genes loosely linked on the same chromosome show similar recombination the tightly linked ones

  • Option 4)

    Tightly linked genes on the same chromosome show very few recombinations

 

Answers (1)

As learnt

Recombination -

Morgan experimented and found that when the two genes in a hybrid cross situated on same chromosone, the proportion of parental gene combination were much higher than the non-parental type..

Based on this observation, he coined the term recombination.

- wherein

To describe the generation of non-parental gene combinations

 

 

 

Cross B in Morgan's Experiment -

In cross B, genes were loosely linked and showed higher recombination.

- wherein

White and miniature wing showed 37.2% recombination.

Cross B in Morgan's Experiment

 

 

 

Genetic Maps -

Genetic maps are widely used as a starting point in the sequence of whole genomes.

- wherein

In a genetic map, the frequency of recombination between genes pairs on the same chromosomes is a measure of the distance between genes, and 'mapped' their positions on the chromosomes.

 

 

Recombination is not easy for tightly linked genes on the same chromosome.


Option 1)

Tightly linked genes on the same chromosome show higher recombination

This option is incorrect

Option 2)

Genes far apart on the same chromosome show very few recombinations

This option is incorrect

Option 3)

Genes loosely linked on the same chromosome show similar recombination the tightly linked ones

This option is incorrect

Option 4)

Tightly linked genes on the same chromosome show very few recombinations

This option is correct

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