Select and support the most appropriate response, and explain why each of the in

Question

Select and support the most appropriate response, and explain why each of the incorrect statements is eliminated.

The observation that identical genotypes express similar phenotypes in different environments is an indication that
a. environmental components have a large effect on the expression of the phenotype.
b. this phenotype is not multifactorial.
c. the genotype is for a single gene.
d. the environment is equally important to the phenotype as the genotype.
e. the phenotype is multifactorial but the genotype strongly influences the phenotype

Explanation / Answer

Answer : b. this phenotype is not multifactorial and c. the genotype is for a single gene.

Because multifactorial trait involves two or more genes and one or more environmental factors.

When the environmental conditions are different, expression of similar phenotypes indicates that genotype has greater influence than environmental conditions. This cannot be true if it is multifactorial where more genes are involved.

Reason for other options :

a. environmental components have a large effect on the expression of the phenotype : This is true if phenotypes are different for the same genotype under different environmental conditions.

d. the environment is equally important to the phenotype as the genotype : This is true when different phenotypes are expressed.

e. the phenotype is multifactorial but the genotype strongly influences the phenotype : Multifactorial traits result from interaction of one or more environmental factors and two or more genes. And the interaction of genes with each other and with the environment produces variable phenotypes.

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