REPRODUCTION
ASEXUAL VS. SEXUAL
QUESTIONS TO ANSWER???
1. How does DNA reproduce?
DNA Replication
2. How do cells reproduce?
Mitosis and Meiosis
3. How do organisms
reproduce?
ASEXUAL
Reproduction that involves only one parent
(offspring are genetically identical to
parent).
• Occurs in unicellular organisms
Examples:
1. Binary Fission: single cell
splitting into two cells of equal size
that are genetically identical.
(prokaryotes – aka bacteria)
2. Mitosis (eukaryotes – aka Ameba)
SEXUAL
The production of new
offspring by the combining of
gamete cells from two
separate individuals through
fertilization and the formation
of a zygote.
SEXUAL
ENCOUNTERS OF THE
FLORAL KIND
Reproduction in plants: 2 major forms
1. Spores: typically in seedless vascular
plants like ferns
2. Seeds:
 A. Angiosperms (Flowering Plants): vascular plant
whose seeds are enclosed in an ovary.
 B. Gymnosperms (Cones): vascular plant that bears
naked seeds.
Not enclosed in
an ovary.
REPRODUCTION: ALTERNATION
OF GENERATIONS
The basic life cycle pattern for most plants
Sporophyte stage
 Diploid (2n), asexual,
* produces spores
Gametophyte stage
 Haploid(n), sexual,
* produces gametes: Antheridium ( sperm - pollen)
or Archegonium (egg).
REPRODUCTION WITH
FLOWERS, FRUITS
& SEEDS
pollination- plant fertilization
when pollen meets egg.
- Color of flower attracts insects to
fertilize flower
- beginning of fruit and seed formation
- fruits and seed are attractive to birds
who eat and spread seeds.
Is it possible for plants to
reproduce year round? What
could effect reproduction?
PARTS OF THE
FLOWER
Stamen: Male part of plant that produces
pollen.
 Anther and filament
Pistil (carpel): Female part of plant that
produces egg.
 Stigma
 Style
 Ovary: produces the eggs
 When mature will form fruit to protect the seed and aid in
dispersal.
* When pollen and egg meet = zygote
* The zygote will
form an embryo
housed inside of a
seed.
* Only flowering
plants produce
fruit.
ANIMAL
REPRODUCTION
Development
Gametes: sperm and egg (haploid
or n) formed through meiosis)
Fertilization: joining of gametes sperm and egg nuclei to form a
zygote.
Zygote (diploid or 2n) then
undergoes mitosis to form embryo
to organism.
SO LET’S DISCUSS…
Discuss with your partner and write
a small paragraph (3-5 sentences) in
your notebook over each of the
following…
1. How does DNA, DNA replication, mitosis
and meiosis tie into reproduction of
organisms?
2. Explain why sexual reproduction allows
for more genetic variation in organisms
and how this would benefit the
adaptiveness and possible evolution of
species.
3. Is it possible for asexually reproducing
species to share genetic information?
(Think about antibiotic resistance)
Compare and Contrast with Your
Partner
Make a T-chart or Venn diagram for each
of the following in your notebook:
* Mitosis vs Meiosis
* Asexual vs Sexual Reproduction
* Reproduction in plants vs animals