<image 1> In Ayrshire cattle, the mahogany/red locus is an autosomal gene. In both sexes, mahogany homozygotes are mahogany colored, and red homozygotes are red. However, the mahogany/red heterozygote is mahogany if male and red if female. Here is a pedigree for an Ayrshire family that is of great interest to Farmer MacDonald. (In the pedigree, open circles and squares indicate the mahogany phenotype; filled indicate red.) Although Elmer has long ago become a huge pile of Big Macs, Farmer MacDonald has frozen a good supply of Elmer's semen and has used it to artificially inseminate Elmira. What is the probability that Elmira will produce a mahogany female calf?
['1/2', '1/4', '3/4', '1/8', '1/16']