Two brown-eyed parents have produced three blue-eyed sons. if they have another child, how likely is it that the child will be brown-eyed

%

Explanation:

Two brown-eyed parents have produced three blue-eyed sons . This means that the parents have heterogyzous genotype with one blue allele. Here, brown color is dominant over the blue color of the eye.

Let, the brown color eye allele be represented by "B" and the blue color allele be represented by allele "b"

So the genotype of parents would be "Bb"

If a cross is carried out between two parents with genotype "Bb" the following offspring will be produced  -

Bb x Bb

BB, Bb, Bb, bb

So out of the four offspring three children have brown color eye.

Thus the probability of a child having brown color eye is

%

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.