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.
Explain how independent assortment leads to different genetic combinations in offspring. By assessing first single traits, then two traits at a time, Mendel determined that the alleles for different genes segregate independently when gametes form. This is the principle of independent assortment.