Bellringer:Complete the Punnett Square
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Transcript of Bellringer:Complete the Punnett Square
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Bellringer:Complete the Punnett SquareG- green seedsg- yellow seeds
g g
G
g
G g G g
g g g g
Genotype:50% Heterozygous Gg50% Homozygous gg
Phenotype:50% Green50% yellow
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REPRODUCTION in Flowering Plants
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I. FLOWERS Are the organs of reproduction in flowering plants. Reproduction of flowering plants takes place within
flowers.
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sepal
Parts of A Flower
Sepals and petals are modified leaves.– Sepals are the outermost
layer that protect thedeveloping flower
– Petals can help to attract animal pollinators by being brightly colored.
petal
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A stamen is the male structure of the flower.
– anther produces pollen grains– The pollen contains the male
gametes (sperm) – filament supports the anther
stamen
filament anther
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Pistil style
stigma
ovary
The innermost layer of a flower is the female pistil. (Also called a carpel)
– stigma is sticky tip – style is tube leading from
stigma to ovary – ovary produces female gametes– Inside the ovary are the ovules
or eggs
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Flower Parts
pistil
ovule
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II. POLLINATION A. Anther splits open when the pollen are
mature B. Pollen are carried to the stigma by wind,
water, or animals. THIS is pollination C. Plant reproduction is most successful when
pollination rates are highPollination is part of - D. Sexual reproduction, which results in
greater genetic diversity (good for the species survival)
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Wind pollinated flowers have small flowers and large amounts of pollen.
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• Animal pollinated flowers have larger flowers and less pollen.
pollen grains
– pollination occurs as animals feed from flower to flower– animal pollination is more efficient than wind pollination
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III. FERTILIZATION
A. Pollen is carried to the stigma in pollination B. A pollen grain grows a tube down the style
to the ovary C. Sperm travel down the tube D. In a process called fertilization, the sperm
fertilizes the egg. E. The fertilized Egg is called a ZYGOTE.
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Fertilization
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IV. FRUITS AND SEEDS A. Following fertilization, the ovary develops
into a fruit and the ovules become the seeds inside, while the rest of the flower dies.
B. Fruits help protect the seeds until they mature and help scatter seeds into new habitats.
-Fruits are the part of the plant that contain seeds: cucumbers, maple “helicopters”, green peppers, squash are all fruits.
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Flower to Fruit
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V. GERMINATION A. At maturity, the seed coat dries and
hardens, enabling it to survive harsh conditions B. Once conditions are favorable, the seed
germinates (sprouts/grows) and becomes a new plant.
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Seed Anatomy
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Seed Germination