Part 1: Plant Reproduction

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Part 1 Plant Reproduction

• Asexual and Sexual

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Definition of Plant Reproduction

• Reproduction
• Process by which organisms duplicate themselves
• Propagation
• Deliberate reproduction of plants either sexually
  or asexually.

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Sexual and Asexual Reproduction

• Sexual Reproduction
• Through formation of seeds
• Requires two sex cells or gametes
• Formed by meiosis
• Each requires one set of chromosomes (haploidal)
• Two gametes form cell with two sets of
  chromosomes (diploidal)
• Zygote

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Sexual and Asexual Reproduction

• Asexual reproduction
• Vegetative process
• Eliminates genetic variation
• Facilitated by combination of
• Mitosis
• Normal division of cell nucleus
• Cytokinesis
• Completion of division and formation of cell wall

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Sexual and Asexual Reproduction

• Homologous Chromosomes
• Produce different plants
• Homozygous Chromosomes
• Produce nearly exact duplicates

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Cootie Catcher Review

• Using the template provided, follow the
  instructions to make your very own cootie
  catcher.
• To label the cootie catcher, put colors on the
  front, numbers on the inside and definitions
  under the flaps.
• You will have four main flaps to write the
  definitions of the following terms
• Reproduction
• Propagation
• Sexual Propagation
• Asexual Propagation

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Part 2

• Breaking down Sexual and Asexual Propagation

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Sexual Propagation

• Sexual Reproduction
• The union of the female and male sex cells to
  produce a seed (embryo).
• Ovule female sex cell.
• Pollen male sex cell.
• Embryo (seed-germ) an immature plant.
• Sexual reproduction involves the creation of a
  genetically new individual.
• Uses seeds in one of two ways
• Scarification
• Breaking seed coat to permit water uptake by
  embryo
• Stratification
• Exposure of seed to low temperatures
• Destroys growth inhibitors
• Occurs naturally during winter

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Benefits of Sexual Propagation

• Less expensive than asexual
• Faster than Asexual
• It is the only way to get new varieties of plants
• Some plants can only produce sexually

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Bell-ringer ExerciseShow What You Know!

• In your own words, describe sexual propagation.
• List two benefits of sexual propagation.
• What two ways can you prepare a seed for
  germination?

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Asexual Propagation

• The reproduction of a plant without the uniting
  of a pollen or ovule.
• Can be referred to as vegetative propagation
  since no seed is involved.
• Uses vegetative parts of existing stock plant to
  grow new plants called daughter plants.
• Leaves, stem or roots
• The daughter plant will have traits identical to
  those of the plant which they were derived, also
  called a clone
• Clones
• New plants reproduced asexually from single plant
• Ramet
• Individual plant within clone
• Clonal Varieties
• Important plants propagated almost totally by
  asexual means

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Types of Asexual Propagation

• Cutting
• Using a short section of plant stems for
  propagation.

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Types of Asexual Propagation

• Layering
• Involves getting roots to grow from the stem.
  I.e., magnolia tree

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Types of Asexual Propagation

• Budding
• Taking a bud from one plant and moving it to
  another.

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Types of Asexual Propagation

• Separation
• Using vegetative structures are separated from
  the parent plant as a natural means of
  reproducing.

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Types of Asexual Propagation

• Grafting
• Placing a section of a stem of one plant onto
  another plant.

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Types of Asexual Propagation

• Tissue culture
• Taking a group of cells or a single cell and
  growing it to a plant.

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Benefits of Asexual Propagation

• True traits of the parents
• Maintains genetic purity with
• 100 replication of parent plant.
• Produces more plants faster
• No seed
• Some plants do not produce a seed or the seeds
  are too small to work with.

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Show What You Know!

• In your own words, define asexual propagation.
• List the benefits of asexual propagation.
• List the types of asexual propagation and give
  one key word for each type.

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Exit Ticket

• ________ is the deliberate reproduction of plants
  either sexually or asexually.
• The process by which organisms duplicate
  themselves is called____________.
• Homologous produces ________ plants and
  homozygous produces __________ plants.
• Define asexual propagation.
• Define sexual propagation.
• Explain the processes that facilitate asexual
  propagation.
• List the benefits of sexual and asexual
  propagation.
• Select three types of asexual propagation and
  describe the process of each.

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Show What You KNOW!

• List the benefits of sexual and asexual
  propagation.