The information in pedigrees that is useful for mapping disease genes is sometimes limited. this pedigree shows segregation of neurofibromatosis, which is a fully-penetrant, autosomal dominant condition, and a single nucleotide polymorphism, snp3. why are the genotypes of the children noninformative for determining the degree of linkage between the disease-causing gene nf and snp3?

Explanation:Most complex diseases arise due to combinations of genetic factors.

in which different subsets of individuals develop a given disease due to different sets of genetic factors.

answer: - few nutrients

high pressure

low temperatures

explanation: 1. few nutrients:   open-ocean zone is located way far from the land, which is the main source of the essential nutrients.2. high pressure: pressure increases by 1 atmosphere for every 10 meters increase in depth.3. ample sunlight: a large fraction of the sunlight is reflected back to the atmosphere from the sea surface. 4. varying salinity: below the thermocline, the water is isolated from the atmosphere so the salinity remains stable over the year.5. low temperatures:   the temperature of open-ocean zone ranges from a low of -2°c to an average of 17°c