Genetics/Punnett Squares10/15/12 *Take out your DRAGON GENETICS questions* 1.Dragon building...
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Transcript of Genetics/Punnett Squares10/15/12 *Take out your DRAGON GENETICS questions* 1.Dragon building...
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Genetics/Punnett Squares 10/15/12
*Take out your DRAGON GENETICS questions*
1. Dragon building2. Groundwater quiz3. Genetic review4. Punnett Squares
Do Now [journal]1. What are two ways
that humans interact with estuaries?
2. What’s your partners favorite scary movie?
3. What is the effect of drilling a well on groundwater resources?
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Punnett Squares [journal]
THINK: write your answer to “why are punnett squares useful?”
PAIR: write down what your partner thought.
SHARE: as a class we will compile why punnett squares are useful.
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Topic: Punnett SquaresEssential Question: How are Punnett Squares useful?
Punnett SquaresAre used to predict the outcome of breeding or mating using genes and their alleles
BackcrossIf you know the outcome, you can find out the parent
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T = Tropism t = no tropism
Tropism: the movement of an organism towards a stimulus
Ex: a plant (producer) needs SUNLIGHT in order to get it’s energy
So how will it experience TROPISM?
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Punnett Practice
Let’s do a Punnett Square for this trait:
TT male crossed with a Tt female.
T = dominant (tropism)t = recessive (no tropism)
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Topic: HeredityEssential Question: How are traits passed on from parent to offspring?
HeredityThe passage of genetic instructions from one generation to the next generation ChromosomeCarries genetic information from parent to offspring in the form of GENES
AlleleAlternate forms of genes
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Topic: HeredityEssential Question: How are traits passed on from parent to offspring?
Natural selectionThe process where organisms better adapted to their environment tend to survive and produce more offspring.
Selective breedingThe process of breeding plants and animals for particular traits.
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What do the inner, middle, and outer circles represent?
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Outer circle = general kind of finch
Middle circle = describes their bill shape
Inner circle = niche, where they get their energy
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Natural selection
If there was a FREEZE and the insect population dropped considerably, which finches would survive? Which would die?
The survivors are more likely to produce offspring. The decreased population is more likely to have less offspring.
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Selective breeding
Dogs are all the same SPECIES meaning they can all mate with each other to produce offspring.
Humans have selectively bred for their traits, not through natural selection.
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Topic: HeredityEssential Question: How are traits passed on from parent to offspring?
Natural selectionEx: Finches on the Galapagos Islands
Selective breedingEx: Dog breeds