Final answer:
Genomic imprinting as related to the fur color phenotypic ratio in mice, including the concept of epistasis where the C gene is epistatic to the A gene, is a high school-level biology topic.
Step-by-step explanation:
The subject of genomic imprinting in mice that you are asking about falls under the category of Biology, specifically genetics. In the context provided, the imprinting control region (ICR) plays a vital role in genomic imprinting. It is a form of epigenetic regulation in which certain genes are expressed in a parent-of-origin-specific manner. When discussing the fur color of mice, epistasis is an essential concept where one gene can mask the expression of another gene. The C gene is considered epistatic to the A gene, where the recessive c allele can lead to albinism regardless of the A allele present. For instance, mice with genotypes AAcc, Aacc, and Aacc will all show the albino phenotype. When crossing heterozygotes of both genes (AaCc x AaCc), the expected phenotypic ratio would be 9 agouti:3 solid color:4 albino. This information is foundational in understanding how genetic interactions can affect phenotype and is a high school-level biology topic.