In life cycles that alternate between haploid and diploid stages, ____________ acts to reduce the number of chromosomes per cell
from two sets to one set. In life cycles that alternate between haploid and diploid stages, ____________ acts to double the number of chromosome per cell from one set to two sets. In life cycles that alternate between haploid and diploid stages, ____________ acts to keep the number of chromosomes per cell the same. In animals, a single diploid cell called a ____________ divides by mitosis to give rise to all the cells of the adult body.
In life cycles that alternate between haploid and diploid stages, ____meiosis_ acts to reduce the number of chromosomes per cell from two sets to one set. In life cycles that alternate between haploid and diploid stages, ___fertilization__ acts to double the number of chromosome per cell from one set to two sets. In life cycles that alternate between haploid and diploid stages, ______mitosis______ acts to keep the number of chromosomes per cell the same. In animals, a single diploid cell called a ____zygote________ divides by mitosis to give rise to all the cells of the adult body.
Mutation is random because there is really no way of knowing whether a child will inherit it, whereas natural selection is predisposed in either parent.
•Early
during the first nuclear division.
•Homologous
chromosomes pair along their length.
•Held
tightly by protein ‘zipper’.
<span>Homologous Recombination: </span>
•Genetic
exchange (crossing
over<span>)
occurs between homologous chromosomes. It then becomes a mix of both paternal and maternal genes (father and mother respectively)</span>
