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.
the mixing of similar areas of DNA between the chromosomes of an egg cell and the chromosomes of a sperm cell during fertilization. the random selection of certain chromosomes for inclusion in a reproductive cell. Independent assortment relates to __________.