Reproduction in living organisms

1
Reproduction in living organisms

• (other organisms not you)

(that topic is covered in health class)
2
Asexual reproduction

• 1 parent
• Offspring genetically identical to parent

3
Asexual reproduction

• Examples binary fission (bacteria),
  fragmentation (protists), budding (fungi),
  vegetative reproduction (plants)

ALL variations on mitosis
4
Sexual reproduction

• 2 parents
• Offspring inherit ½ from dad, ½ from mom
• Meiosis generates gametes, also generates genetic
  variety in offspring

5
Human life cycle
Multicellular diploid organism(2n)
mitosis
meiosis
Unicellulardiploid zygote(2n)
Unicellular haploid cells(gametes)(n)
fertilization
Meiosis splitting chromosome pairs 2n ?
nMitosis making exact copy
6
Protists / fungi / plants
Multicellular diploid organism(2n)
sporophyte
mitosis
meiosis
Unicellular diploid zygote(2n)
Unicellular haploid cells(n)
(spores)
fertilization
Unicellularhaploid gametes(n)
mitosis
Multicellularhaploid organism(n)
gametophyte
mitosis
7
Human life cycle
Multicellular diploid organism(2n)
mitosis
meiosis
Unicellulardiploid zygote(2n)
Unicellular haploid cells(gametes)(n)
fertilization
8
Protists / fungi / plants
Multicellular diploid organism(2n)
mitosis
meiosis
Unicellular diploid zygote(2n)
Unicellular haploid cells(n)
(spores)
fertilization
Unicellularhaploid gametes(n)
mitosis
Multicellularhaploid organism(n)
mitosis
9
Moss(nonvascular plants)
sporophyte
gametophyte
gametophyte dominates
10
Ferns(seedless vascular plants)
sporophyte
sporophyte dominates
11
Pine treeGymnosperms
tiny gametophyte inside cone
sporophyte
sporophyte dominates
12
SunflowerAngiosperms
tiny gametophyte inside bottom of flower
rest of plant sporophyte
sporophyte dominates