Question

In gene interaction, genes at different loci contribute to the determination of a single phenotypic characteristic. How does gene interaction differ from dominance? In your answer consider: Do genes interact or do gene products interact? How can the different levels of interaction be expressed-molecular, cellular and organismal? Include examples to gene interactions that produce novel phenotypes.

Answer 1

Answer:

• In this case, we have to different terms.
• Dominance refers to the interaction between two alleles in a single gene where one allele mask the expression of the other allele.
• The gene that mask the expression of other allele is called dominant and the allele that is being masked is called recessive.
• In gene interaction, the situation is more complex because we have the interaction between two genes.
• Both terms differentiate between each other in the number of genes acting.
• In dominance, there is only one gene while in gene interaction there are more than one. In gene interaction, the products of a determined gene will affect the expression of a second gene.
• One example is epistasis, where the expression of an epistatic gene will mask the expression of a second gene.
• A real example of gene interaction is the coat color in mice where there are two alleles, A codes for the agouti color and a codes for a solid colored fur.
• At the same time, there is a second gene which codes for a protein that allows the deposition of color.
• If the gene has a recessive genotype, the protein wont be produced and the gene A wont be expressed, producing an albino mice.

Please rate my answer............................. thank u......................................