Crossing Over and Independent Assortment

DE Bio Unit 4

What kind of chromatids are shown?

non-sister

What kind of chromatids are shown?

chiasma

What kind of chromatids are shown?

recombinant

when homologous chromosomes pair up during prophase 1, they form a _____

tetrad

when the non-sister chromatids overlap, they form ______

chiasmata (singular - chiasma)

when the chiasmata are formed, parts of the chromatids _______ and reanneal on the other chromatid

break off

when chromatids break and reanneal on the other chromatid, alleles are exchanged forming new _______________

genetic combinations

what is the benefit of crossing over and independent assortment?

offspring have genetic variation, increasing change of survival and ability to adapt

in species that carry out sexual reproduction, where to the chromosomes in a body cell come from?

½ Parent One, ½ Parent Two

each chromosomes has a corresponding chromosome that contains the same genes

homologous pair of chromosomes

when a diploid cell divides it forms ______

two Haploid daughter cells

every gamete is _____

unique

During Metaphase 1, homologous pairs are randomly lined up which means each daughter cell ends up with a random combination of ______

chromosomes