meiosis Flashcards
use of meiosis
to produce gametes because products are genetically different
meiosis 1
PMATC
diploid parent cell divides to make two haploid daughter cells each with 1 chromosome set (consisting of two chromatids in each chromosomes)
chromosomes replicate before meiosis 1
meiosis 2
chromatids split to make 4 haploid nuclei (each chromosome consists of one chromatid)
how meiosis increases genetic diversity
crossing over
independent assortment
independent assortment
random alignment of homologous pairs on the equator in metaphase 1 of meiosis
crossing over
during prophase 1 of meiosis
non sister chromatids of paired chromosomes cross over at chiasmata and break and re-join, swapping alleles
monosomy
tuners syndrome
missing a copy of a chromosome
trisomy
downs syndrome
extra copy of a chromosome