FINAL: unit 3 Flashcards
(21 cards)
interphase
subdivided into G1 phase, S phase, and G2 phase
- cells DO NOT divide
g1 phase
growth and normal metabolic processes
s phase
DNA replication
g2 phase
growth and duplication of organelles, getting ready for M phase
G0 exit
differentiated cells exit the cell cycle and do specific functions in the tissue they reside
mitosis
occurs in body cells for growth, repair, asexual reproduction
how many divisions does mitosis have?
1 division
- diploid (2n -> 2n)
is there crossing over or genetic variation in mitosis?
no
what does mitosis result in?
2 identical daughter cells
- clones of the parent cell
meiosis
occurs in germ cells to make gametes for reproduction
how many divisions does meiosis have?
2 division
- haploid (2n -> n)
what does the meiosis create?
4 genetically unique cells
is there genetic variation in meiosis?
yes, crossing over and independent assortment
what regulates the cell cycle?
cell cycle checkpoints
what promotes mitosis?
M-phase promoting factor
what end of the DNA strand are new nucleotides added?
3’ end
how is the sequence of the new strand determined?
complementary base pairing with the template strand
where does crossing over occur?
between non-sister chromatids
how to tell if two alleles are linked?
if there are more parental than recombinant
calculating map distance
total recombinant/total # of offspring
MD < 50 = linked
what is the independent assortment ratio?
9:3:3:1 for phenotypes
