When studying corolla length in Nicotiana longiflora, East crossed a pure-breeding short-corolla line with a pure-breeding long-corolla line. The intermediate phenotype of both the F1 and F2 generations led him to which of the following conclusions?

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Corolla length exhibits discontinuous variation, which results in the expected 3:1 F1 ratio and fits the model of a single-gene trait.

Corolla length is controlled by multiple genes and phenotype is influenced by gene interaction and environmental factors.

Corolla length is controlled by a single gene and phenotype is influenced by gene interaction with a modifier gene.

Corolla length is controlled by multiple genes and phenotype is due to additive factors based on Mendelian ratios and is not affected by environmental factors.

 

asked Jun 24, 2013 in Genetics by GeneX ~Top Expert~ (7,947 points)
    

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Corolla length is controlled by multiple genes and phenotype is influenced by gene interaction and environmental factors.

 

answered Jun 24, 2013 by GeneX ~Top Expert~ (7,947 points)

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