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.
Independent assortment between two heterozygous loci: â¢ If the parental gametes are AB and ab, you will notice that one meiocyte produces either parental gametes or recombinant gametes, not both types. â¢ The outcome of this is event is two parental gametes (50%) and two recombinant gametes (50%). From one meiocyte four different gametes are produced. â¢ The outcome of this is event is two parental gametes (50%), AC and ac; and two recombinant gametes (50%), Ac and aC. â¢ You will notice that the A/a locus segregates at anaphase I, first division segregation.