In this situation, it is a straightforward matter to cross one of the two strains to N2 males (or to generate a homozygous male stock from one of the mutant strains), and then cross the resultant heterozygous males to the second mutation to generate the a/+; b/+ trans-heterozygote.
Campbell County, Kentucky. Campbell County is a county located in the U.S. state of Kentucky. As of the 2010 census, the population was 90,336. Its county seats are Alexandria and Newport. The county was formed on December 17, 1794, from sections of Scott, Harrison, and Mason Counties and was named for Colonel John Campbell (1735â1799), a Revolutionary War soldier and Kentucky legislator.
Newport, Rhode Island. For other uses, see Newport (disambiguation). Newport is a seaside city on Aquidneck Island in Newport County, Rhode Island, United States. The City of Newport is located approximately 37 miles (60 km) southeast of Providence, 21 miles (34 km) south of Fall River, and 74 miles (119 km) south of Boston.