Chapter 38sintichscience.weebly.com/uploads/2/2/4/7/22479874/20_ch_38... · Chapter 38 ~ Plant...
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Chapter 38 ~
Plant Reproduction
and Development
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Reduced gametophytes – microscopic and can
be protected
Heterospory – two types of spores (male and
female)
Ovules and egg production – ovule protects
developing zygote
Pollen and sperm production – water proof
Seeds – multicellular, protective coating, can
store energy (spores can’t)
5 ADAPTATIONS FOR SUCCESS OF
SEED PLANTS
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SEXUAL REPRODUCTION
• Alternation of generations: haploid (n) and diploid (2n) generations take turns producing each other
• Sporophyte (2n): produces haploid spores by meiosis; these spores divide by mitosis giving rise to male and female haploid plants called….
• Gametophytes (n): develop and produce gametes
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FLORAL VARIATIONS
Floral organs: sepals, petals,
stamens (male), carpels (female)
How did Mendel cross the pea
plants?
What 2 laws were developed?
What is the dif ference between
genotype and phenotype?
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GAMETOPHYTE DEVELOPMENT
•Male gametophyte: (in pollen sacs of anther)
• Divides by meiosis into 4 1n microspores
• Mitosis produces a generative cell (sperm) and a tube cell (pollen tube)= a pollen grain
•Female gametophyte: (in ovule)
• Divides by meiosis to 4 cells, only 1 survives to a 1n megaspore
• 3 mitotic divisions forms the embryo sac
• Includes: 1 egg cell (female gamete) and 2 polar nuclei
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DOUBLE FERTILIZATION
• Pollination (pollen grain lands on a receptive stigma)
• Tube cell (pollen tube produced down the style)
• Generative cell (2 sperm by mitosis)
• Enters ovary
• 1 sperm fertilizes egg to form zygote; other sperm combines with 2 polar nuclei to form 3n endosperm (food-storing tissue)
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THE SEED
From fertilized ovule…..
The mature seed:
seed coat (protection)
cotyledons (seed leaves)
embryo
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SEED GERMINATION
• Seed dormancy (low metabolic rate and growth
suspension)
• Imbibition (uptake of water) – triggers metabolic
changes
• Radicle first, then shoot tip; stimulated by light
• Germination
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Produces clones
Fragmentation
Pieces of parents break off to form new individuals
that are exact genetic replicas
Other examples: Cutting, test -tube cloning
Some flowers self-fertilize and others prevent it to
ensure genetic variation
ASEXUAL REPRODUCTION
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Artificially selecting traits in plants
Genetically modified organisms
Ex: corn (increase in kernels), Golden rice
(increased vitamin A)
Biofuels – decreased dependence on fossil
fuels
Concerns: fear of allergies, effects of non-
target organisms
PLANTS AND GENETIC ENGINEERING