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Lecture 15

BIOL 102 Lecture Notes - Lecture 15: Telophase, Spermatogenesis, Cytokinesis


Department
Biology
Course Code
BIOL 102
Professor
Wayne Snedden
Lecture
15

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12/05/2012
Biology Chapter 15 Review
Sex & Division
-Meiosis
Preparation of DNA for combination with DNA of another individual
Sex and Diploidy (2N)
-Gametes = sex cells; have 1 set of chromosomes and are 1n or
haploid
-Combine in new cell (zygote)
-One from mother, one father 2n or diploid
In a 2n organism there are 2 homologous chromosomes; 1 from
father & mother
-Homologous chromosomes come together: synapse
Form a synaptonemal complex where there is a breakage and
crossover of genetic material between chromatids of the
chromosomes
-Sister chromatids have the same genetic info
Synaptonemal Complex
-DNA is cut and recombined
-Holds the chromatids of the homologous chromosomes close together
until crossover is complete
Crossover & Chiasmata
-Forms X shaped structure – Chiasma
Meiosis
-Crossover & Chiasmata
-Prometaphase I
Nuclear membrane goes away
Bicalent attach to kinetochore
-Metaphase I
Bivalents align on metaphase plate
-Anaphase I
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