genetics examples in real life terms to know:
TRANSCRIPT
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Genetics
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Examples in real life
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Terms to know:
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Passing of from one generation to the next.
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Inherited forms of a characteristic.
Examples: Flower color,
Eye color, hair color, etc.
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All must have at least
2 .
One from each parent.
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Brown hair
Blonde hair
Blue eyes
Green eyes
Remember: 2 genes for each TRAIT
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Brown hair
(brown allele)
Blonde hair
(blonde allele)
Different forms of each gene
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Sometimes one gene overpowers the other.
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-Gene overpowers the recessive gene
-Always shows up if present
-Gene designated by captial letter
- Ex: D
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-gene that gets overpowered
-Only shows up if 2 recessive genes are present
- gene designated by lower case letter
-Ex: d
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-the genes of a pair are different
-Ex: Dd
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-the genes of a pair are the same
-Ex: DD or dd
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The actual gene combinationEx: DD Dd dd
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The physical appearance
Ex: Black Black Red
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This knowledge can be used to manage or
predict physical outcomes.
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Use a Punnet Square
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Example:
Tongue rolling is dominant (T)
No tongue rolling is recessive (t)
Cross 2 heterozygous people: TtT
T
t
t
TT Tt
Tt tt
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Genotype
# of homozygous rollers
# of heterozygous rollers
# of homozygous non rollers
1
2
1
T
T
t
t
TT
Tt
Tt
tt
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Phenotype
# of rollers
# of non rollers
3
1
TT
Tt
Tt
tt
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Review• Dominant overpowers Recessive • Homozygous - PP pp• Heterozygous – Pp• Genotype – the genes• Phenotype - appearance