In cattle, expression of a roaning pattern occurs when at least one "R" allele is present at the roaning locus. Additionally, expression of black hair is caused by the presence of the "E" allele where "EE" and "Ee" result in all black cattle, and a genotype of "ee" results in all red cattle. Based on this information, which of the following statements best characterizes the relationship between the extension and roaning loci in cattle?
Question 14 options:
The roaning locus is codominant with the extension locus.
Extension alleles and roaning alleles both contribute to the additive nature of coat color/pattern inheritance in cattle.
The extension locus and roaning locus in cattle are considered linked.
Heterozygosity at the roaning locus and extension locus expresses a distinct intermediate phenotype.
The roaning locus has an epistatic effect on expression of the extension locus.
Both the extension gene and roaning gene are pleiotropic.