U04 Reproduction

Reproduction CONTENTS RESOURCES

CONTENTS Reproduction Types Advantages and disadvantages Asexual reproduction Vegetative Spore formation Artificial Fertilisation External Internal Sexual reproduction Sexual reproduction Mixed reproduction Reproduction in animals Reproduction in plants Embryonic development Viviparous Oviparous Ovoviparous Post-embryonic development Direct Indirect Sexual reproduction Sexual reproduction Stages Pollination Fertilisation Seed germination Life cycle Life cycle of a plant Life cycle Life cycle of a bird Asexual reproduction Gemmation Fragmentation REPRODUCTION H ands on Make a detailed drawing

RESOURCES Types of reproduction Advantages and disadvantages Fragmentation Gemmation Sexual reproduction in animals Mixed reproduction External fertilisation Internal fertilisation Oviparous development Viviparous development Post-embryonic development: direct The life cycle of a bird Ovoviparous development Post-embryonic development: indirect Spore formation The life cycle of plants Artificial asexual reproduction Vegetative reproduction Sexual reproduction in plants Pollination Seed germination Fertilisation Make a detailed drawing Links Animal reproduction

ASEXUAL REPRODUCTION
Only one parent
New genetically identical living beings are produced.
Some animals Some plants Types of reproduction Protozoa Fungi Algae Unicellular oganisms NEXT

Types of reproduction
SEXUAL REPRODUCTION
Two parents: a
male and a female
Descendants have
genetic material from
both parents.
Multicellular oganisms

Advantages and disadvantages
Advantages
requires only one parent
faster and easier
rapid population growth
no travel is necessary
Disadvantages
no genetic diversity
difficulty in adapting to environmental changes
clone Asexual reproduction NEXT

Advantages and disadvantages
Advantages
genetic diversity in species
ability to adapt to environmental changes
Disadvantages
requires two parents
requires time and energy to find a mate and reproduce
requires travel
Sexual reproduction

Gemmation (budding) Asexual reproduction Fresh water hydra bud The bud separates from the parent and develops into a new individual. NEXT

Gemmation (budding) Colony gemmation Coral Buds remain attached and form a colony.

Fragmentation Regeneration Starfish regenerated arms NEXT

Fragmentation new organisms fragments regenerate parent Planaria worm Asexual reproduction

Snails Sexual reproduction in animals Hhermaphrodites have both male and female gonads. NEXT

ovum spermatozoa Sexual reproduction in animals Unisexual animals have only one type of gonad. male ( ♂ ) female( ♀ ) gonads (testicles) gonads (ovaries)

Mixed reproduction Cnidaria sexual reproduction asexual reproduction larva polyps adult jellyfish or medusa

External fertilisation Life cycle with external fertilisation male( ♂ ) female( ♀ ) Fusion of the gametes occurs outside the female body. developing embryos ova spermatozoa

Internal fertilisation Life cycle with internal fertilisation male ( ♂ ) female ( ♀ ) ovum spermatozoa zygote Fusion of the gametes occurs inside the female body.

Viviparous development Mammals Embryonic development The embryo develops inside the female body. placenta umbilical cord uterus embryo

embryo Fish Birds Embryonic development Reptiles Reptile or bird egg Oviparous development The embryo develops inside an egg, mostly outside the female body. hatching shell chalaza albumin yolk germinal disc shell membrane

shark Embryonic development ray snake lizard The embryo develops inside an egg in the female body. embryo Ovoviparous development

Life cycle of a bird embryonic development After fertilisation, the embryo begins to develop inside the egg. The egg is laid in a nest. The embryo continues to develop during incubation. Hatching The male and female bird mate. The new being leaves the egg.

Some arthropods Oviparous birds Viviparous mammals Post-embryonic development: direct Oviparous reptiles

Post-embryonic development: indirect Simple metamorphosis larva eggs adult continuous transformation (moulting) NEXT

Post-embryonic development: indirect Complex metamorphosis pupa (dormant stage) larva eggs adult

The life cycle of plants FLOWERING PLANTS NON-FLOWERING PLANTS Angiosperms Gymnosperms Mosses Ferns VISIBLE PART gametophyte VISIBLE PART sporophyte NEXT VISIBLE PART sporophyte gametophyte

The life cycle of plants The life cycle of mosses The life cycle of ferns capsule sporophyte gametophyte germination sporangium spores frond fertilisation ♀ ♂ male gametophyte ♂ female gametophyte ♀ prothallus sporophyte spores germination gametophyte male gametophyte female gametophyte fertilisation ♂ ♀ ♀ ♂

fern Spore formation spores moss spores FUNGI ARE NOT PLANTS. spores mushroom

Vegetative reproduction Stolons Bulbs Stem tubers white clover stolon bud potato onion garlic

Artificial asexual reproduction in plants Layering Artificial methods Cuttings Grafting

Sexual reproduction in plants FLOWER gametophyte reproductive organs gametes anther pollen grains anther filament stamen sepals (calyx) stigma style ovary ovules pistil petals (corolla)

Pollination Self-pollination Cross- pollination pollen pollen Wind pollination Insect pollination

Fertilisation in plants ovule Pollen grains land and a pollen tube develops. 1 pollen grains The ovule (female gamete) is fertilised and a zygote is formed. 2 pollen tube male gamete embryo albumin seed cotyledons The ovary becomes the fruit and the ovule becomes a seed. 3 The seed germinates and an embryo develops. 4

Seed germination OXYGEN TEMPERATURE MOISTURE seed cotyledons radicle plumule bud water

Make a detailed drawing: The flower Prepare the slide
Remove some petals.
Place the flower on a glass.
Tape the flower to the transparency.
Cut the transparency into a square.
Place it on a slide frame.
Project the image.
Insert the slide into the projector.
Project the image onto the paper.
Move the projector in close so the entire image fits on the paper.
Draw over the projected image.
Complete the drawing
Add the names of each part of the flower.
sepal ovary style petal stigma anther

Links Animal reproduction http://www.saburchill.com/chapters/chap0031.html Plant Reproduction Tutorial http://www.skoool.ie/content/skoool_learning/junior/lessons/science/plant_reproduction/flash/h-frame-ie.htm Growing plants http://www.bbc.co.uk/scotland/education/bitesize/standard/biology/world_of_plants/growing_plants_rev1.shtml How plants reproduce http://www.emc.maricopa.edu/faculty/farabee/BIOBK/BioBookflowers.html Flowers and reproduction http://www.saburchill.com/chapters/chap0041.html

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U04 Reproduction

by Alkor on Jan 04, 2010

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U04 Reproduction — Presentation Transcript