Great Migration: Life for Migrants in the City. By the end of 1919, some 1 million blacks had left the South, usually traveling by train, boat or bus; a smaller number had automobiles or even horse-drawn carts.
Genetic variation is increased by meiosis During fertilisation, 1 gamete from each parent combines to form a zygote. Because of recombination and independent assortment in meiosis, each gamete contains a different set of DNA.
It states that the 2 alleles (one from each parent), in the offspring, segregates (separates) from each other during the formation of gametes (or sex cells). The random distribution of homologous chromosomes during meiosis is called independent assortment. Answered.