How can epistatic interactions be used to order genes in a pathway?
A)Organisms that are homozygous recessive for two different genes will have the phenotype of an organism that is homozygous recessive for the gene that is first in the pathway.
B)Organisms that are homozygous recessive for two different genes will have the phenotype of an organism that is homozygous recessive for the gene that is last in the pathway.
C)Organisms that are homozygous dominant for two different genes will have the phenotype of an organism that is homozygous dominant for the gene that is first in the pathway.
D)Organisms that are heterozygous for two different genes will have the phenotype of an organism that is homozygous recessive for the gene that is first in the pathway.

Question

Quizplus · Accepted Answer

Organisms that are homozygous recessive for two different genes will have the phenotype of an organism that is homozygous recessive for the gene that is first in the pathway. This is because the first gene in the pathway is required for the expression of all the other genes in the pathway. If the first gene is not expressed, then none of the other genes in the pathway will be expressed, and the organism will have the phenotype of an organism that is homozygous recessive for the first gene.

How Can Epistatic Interactions Be Used to Order Genes in a Pathway