In a dihybrid cross, when would the proportion of parental gene combinations be much higher than non-parental types, as experimentally shown by Morgan and his group?

In a dihybrid cross, when would the proportion of parental gene combin

1.	In a dihybrid cross, when would the proportion of parental gene combinations be much higher than non-parental types, as experimentally shown by Morgan and his group?
Answer» This is possible when the two genes in a dihybrid cross were located on the same chromosome. Morgan associated this with physical association of the two genes or linkage. Morgan hybridized yellow bodied white eyed females to brown bodied red-eyed males and noticed that F2 ratio deviated from the usual. 9:3:3:1

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In a dihybrid cross, when would the proportion of parental gene combinations be much higher than non-parental types, as experimentally shown by Morgan and his group?

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