What molecular conformation (structure) of homologous chromosomes facilitates crossing over

Meiosis is a specialized type of cell division that reduces the chromosome number by half, creating four haploid cells, each genetically distinct from the parent cell that gave rise to them.This process occurs in all sexually reproducing single-celled and multicellular eukaryotes, including animals, plants, and fungi. Errors in meiosis resulting in aneuploidy are the leading known cause of miscarriage and the most frequent genetic cause of developmental disabilitiesdiploid two copies of each type of chromosome (2N) zygote cell produced by fusion of a male gamete and female gamete (sperm and egg cells) haploid individual with one copy of each chromosome. also what the gametes are like when a diploid nucleus undergoes meiosis. (N) genome complete set of genetic information in the haploid set of chromosomes homologous chromosomes chromosomes that have the same arrangement of genetic loci, identical in visible structure and pair during meiosis, each member is called a homolog.

The truman doctrine was an american foreign policy whose stated purpose was to counter soviet geopolitical expansion during the cold war. it was announced to congress by president harry s. truman on march 12, 1947, and further developed on july 12, 1948, when he pledged to contain threats to greece and turkey