AP Biology

1
AP Biology

• Chapter 13
• Meiosis

2
Parent to offspring
3
Mom and Dads DNA contributionThe egg surrounded
by sperm.
4
Locus(Gene locations on chromosomes)
5
Asexual reproductionSee the bud on the side
that is the new organism to be.
6
Sexual Reproduction
7
LE 13-6
Key
Haploid
Diploid
Haploid multicellular organism (gametophyte)
Haploid multicellular organism
Gametes
n
n
Mitosis
Mitosis
Mitosis
Mitosis
n
n
n
n
n
n
n
n
n
Spores
n
FERTILIZATION
MEIOSIS
Gametes
n
Gametes
FERTILIZATION
MEIOSIS
FERTILIZATION
MEIOSIS
Zygote
2n
2n
2n
2n
Diploid multicellular organism (sporophyte)
Zygote
2n
Diploid multicellular organism
Mitosis
Mitosis
Zygote
Animals
Plants and some algae
Most fungi and some protists
8
Fig 13.3 Female XX(Remember kary means
nucleus)
9
Fig 13.3 Male XY
10
Germ cells
11
TWO Divisions
12
Fig 13.8 a (First Division)
13
Fig 13.8b (Second Division)
14
Fig 13.11
15
Mitosis vs. Meiosis
16
LE 13-9
MITOSIS
MEIOSIS
Chiasma (site of crossing over)
Parent cell (before chromosome replication)
MEIOSIS I
Propase
Prophase I
Chromosome replication
Chromosome replication
Tetrad formed by synapsis of homologous chromosome
s
Duplicated chromosome (two sister chromatids)
2n 6
Tetrads positioned at the metaphase plate
Chromosomes positioned at the metaphase plate
Metaphase I
Metaphase
Anaphase
Sister chromatids separate during anaphase
Anaphase I
Homologues separate during anaphase
I sister chromatids remain together
Telophase
Telophase I
Haploid n 3
Daughter cells of meiosis I
2n
2n
MEIOSIS II
Daughter cells of mitosis
n
n
n
n
Daughter cells of meiosis II
Sister chromatids separate during anaphase II
17
LE 13-10
Key
Maternal set of chromosomes
Possibility 1
Possibility 2
Paternal set of chromosomes
Two equally probable arrangements of chromosomes
at metaphase I
Metaphase II
Daughter cells
Combination 2
Combination 1
Combination 3
Combination 4