get out isn we are taking notes. topic no. 23 genetics content obj. you will demonstrate...
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Get out ISN we are taking notes. Topic No.
23 Genetics
• Content Obj. You will demonstrate comprehension of Genetics by watching a brainpop video and correctly answering the questions that follow.
• Language Obj. You will describe and explain how traits are passed using words homozygous, heterozygous, DNA and gene.
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GENETICS
The Study of Heredityhttp://www.brainpop.com/health/geneticsgrowthanddevelopment/heredity/
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HEREDITYThe process in which characteristics pass from parents to offspring.
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TRAITAn organism’s physical characteristics
Examples: eye color, hair color, height
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DNADEOXYRIBONUCLEIC ACIDTHE GENETIC MATERIAL THAT
CARRIES INFORMATION ABOUT AN ORGANISM AND THAT IS PASSED FROM PARENT TO OFF SPRING.
http://www.brainpop.com/science/cellularlifeandgenetics/dna/
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CHROMOSOMEA threadlike cellular structure that carries the information that controls inherited characteristics.
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GENEGENEA SEGMENT OF DNA ON A CHROMOSOME THAT CODES FOR A SPECIFIC TRAIT.
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ALLELESALLELESTHE DIFFERENT FORMS OF A GENE.
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GENE SCAVENGER GENE SCAVENGER HUNTHUNTFind a person with the corresponding gene. Get their first and last initial.
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The BIG Allele is
DOMINANT
It always shows upWe write it with a
CAPITAL LETTER
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The small Allele is
RECESSIVE
It is always hidden when a dominant is present.
It will only show up if there are two recessive alleles
We write it with a lower case letter
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Each genotype has 2 alleles
ONE FROM MOM
ONE FROM DAD
Aa
http://www.brainpop.com/health/geneticsgrowthanddevelopment/genetics/
GENOTYPE- GENETIC MAKE-UP (COMBINATION OF LETTERS)
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HOW DO WE KNOW WHAT LETTER TO USE
Use the FIRST letter of the
DOMINANT Gene
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What are the combination of alleles?
AAAaaa
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PHENOTYPEPHENOTYPEThe physical appearance of a trait
(the trait you can see)Example: eye color, skin color, hair color
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PHENOTYPE is the physical description.
AA
Aa
aa
What will be the phenotype for the following genotypes?
NO AFRO
AFRO
AFRO
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HOMOZYGOUS
SAMEAA, aa
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HETEROZYGOUS
DIFFERENTAa
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Freckles is Dominant to Non freckles____ Freckles ____ No freckles
_______ Homozygous Dominant_______ Heterozygous _______ Homozygous Recessive
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Brown hair is Dominant to Red Hair____ Brown _____ Red
_______ Homozygous Dominant_______ Heterozygous _______ Homozygous Recessive
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HOMOZYGOUS AA/ aa HOMOZYGOUS DOMINANT AA HOMOZYGOUS RECESSIVE aa HETEROZYGOUS Aa MUTATION 3