a women with blue eyes, a recessive trait, marries a man with brown eyes, the dominant trait. they have children with both blue eyes and brown eyes.

what are the genotypes of the parents?

complete the genetic cross and describe the ratio of blue to brown eyes among the children.

what are the genotypes of the children?

The answer is; The man has genotype Tt while the woman has genotype tt

This is assuming that the dominant allele is represented by letter T while the recessive allele is represented by letter t

The punnet square below indicated the genotypes of the parent's and offsprings

The ratio of blue-eyed offspring to brown eyed offsprings is 1:1

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.

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