Download Introduction to Plant Reproduction: Sexual vs

Introduction to Plant Reproduction:
Sexual and Asexual Reproduction
What is reproduction?
• Compare a human with a plant
– We don’t have leaves or roots and a plants do not
have a heart or brain
– BUT we are alike in many ways
• Plants and animals (and humans!) can make
similar copies of ourselves
- Called reproduction
- Two types: asexual and sexual
reproduction
How plants reproduce: Sexual reproduction
• Sexual reproduction in plants is similar to animal
sexual reproduction:
• Requires fertilization
– Combine egg and sperm cells
• Like in animals, egg cells
are produced in female
reproductive organ and
sperm in the male
reproductive organ
– Meiosis creates these
cells
How plants reproduce: Sexual reproduction
• Review: Meiosis produces 4 sex cells with half the
number of chromosomes of original cell
• Sex cells are also called GAMETES
– Have HALF the number of chromosomes, called
HAPLOID
• Male/female reproductive organs can be
on the SAME or SEPARATE plants
• Most plants depend on animals for
fertilization, to help get the egg and sperm
cells together
– Usually a SEED develops
– In some plants a SPORE develops
How plants reproduce: Asexual reproduction
• Some plants do NOT produce seeds – Can you
think of some fruits/vegetables that do not
have seeds?
– Seedless oranges, grapes
• How do these plants reproduce?
– ASEXUAL REPRODUCTION!
• Most plant cells can grow into
other types of cells, and a NEW
plant may be produced from
PART of the plant
How plants reproduce: Asexual reproduction
• Growers cut part of the plant and re-plant it
somewhere else
• It is genetically IDENTICAL to the original plant
– Called DIPLOID because it has DOUBLE the number of
chromosomes than in sex cells
• People have been doing this for hundreds of years