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.
In the field of biology, inherited variation refers to genes and genetic information transferring from both parents to offspring. Biological variation occurs in all species, including humans, plants and other animals. Offspring of all living species derives approximately 50 percent of each parent's genes, giving them resemblance to the parents while displaying novel traits, features and characteristics as well, as noted in a report by the BBC.