Two genes are located on separate chromosomes. One gene determines hair color in foxes, where AA is lethal before birth, Aa is platinum hair, aa is silver hair. A second gene pair B and b determines hair length where short hair is dominant to long hair. A platinum fox that was pure breeding for short hair length is crossed with silver fox with long hair. The F1 contained foxes that were platinum and others that were silver. Two of the platinum F1 foxes were mated. What are the phenotypes and phenotypic ratios for the foxes in the F2 generation. a. 6 platinum short: 2 platinum long: 3 silver short; 1 silver long b. 2 platinum short: 6 platinun long: 1 silver short;3 silver lont c. 1 platinum short: 6 silver long: 2 platinum long: 3 silver short d. 6 silver short: 1 silver long: 2 platinum long: 3 platinum short e. none of these

Option A

Platinum short - AaB-  - 6

Platinum long - Aabb  - 2

Silver short - aaB-   - 3

Silver long - aabb - 1

Explanation:

Aa is platinum hair, aa is silver hair.

A second gene pair B and b determines hair length where short hair is dominant to long hair.

P1  AaBB         x        aabb

   AB   aB        x         ab

F1   AaBb   and   aaBb  (platinum and silver foxes)

      AaBb    x       AaBb

Platinum short - AaB-  - 6

Platinum long - Aabb  - 2

Silver short - aaB-   - 3

Silver long - aabb - 1

a time line cause it goes from 685 to 978

americans began to notice growing differences between the northern and southern sections of the country. there were more people living in cities in the north, which made it more urban. more people lived on farms in the south, which made it more rural. while many people were farmers in the northern states, there were now other ways to make a living, such as working in mechanical cotton gins factories manufacturing cloth, tools and other goods. people in the north supported high tariffs on goods imported from europe because the extra cost encouraged people to “buy american” instead. in the southern states, planters did not like tariffs because they sold most of their production to europe and bought their tools from there as well. southerners believed the protective tariff was something that only northern factory owners keep their profits high. so the southern politicians came up with an idea. they would opt out. they would simply ignore the protective tariff. it was ‘null and void’ in south carolina. the state would not collect the taxes on goods imported into south carolina, no matter what the president said they had to do. this decision led to the nullification crisis.