If a cross between two strains produces 130 parental ditype, 10 non parental ditype and 100 tetratype asci in the progeny, waht is the genetic map distance between the two loci (without correction for undetected double crossovers)?

A genetic map is a type of chromosomal map that shows the relative location of genes and other important characteristics. The map is based on the concept of linkage, which means how close two genes are on the chromosome, the mayor will be the probability that they are inherited together. Following the inheritance patterns, the relative location of the genes throughout the entire chromosome can be established.

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[A genetic map] is a map that shows the relative location of two genetic traits. And the way to determine this is to use the descendants of an organism and keep track of how many times two genetic traits specify here together, for example, hair color and eye color. The higher the percentage of the descendants that have both characteristics at the same time, the closer to the chromosome the genes responsible for the characteristic characteristics.

answer; i believe that the correct answer is(d) nondisjunction during meiosis;

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.