introduction to: genetics in 139 headings vocabulary important information
TRANSCRIPT
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INTRODUCTION TO: GENETICS
IN 139Headings
Vocabulary
Important Information
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GREGOR MENDEL: THE FATHER OF GENETICS
• AT 21 YEARS OLD HE JOINED THE MONASTERYMONASTERY IN BRUNN, AUSTRIA
• HIS JOB WAS TO TEND TO THE GARDENGARDEN
• IN 1851, HE ENTERED THE UNIVERSITY OF VIENNA TO STUDY SCIENCE & SCIENCE & MATHMATH
• IN MATH HE LEARNED THE SUBJECT OF STATISTICS
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• STATISTICS HELPED W/HIS DISCOVERY OF HEREDITY:HEREDITY:– THE TRANSMISSION OF
CHARACTERISTICS FROM PARENTS TO OFFSPRING.
• MENDEL LATER RETURNED TO THE MONASTERY AND TAUGHT HIGH SCHOOL AND KEPT HIS GARDEN GOING.
• HE STUDIED MANY TYPES OF PLANTS BUT HE IS MOST FAMOUS FOR...
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• PISUM SATIVUMPISUM SATIVUM, AKA:– GARDEN PEASGARDEN PEAS!
• OBSERVATION OF 7 CHARACT. OF PEAS:– EACH OCCURRED IN
2 CONTRASTING2 CONTRASTING TRAITS)
• USING STATISTICS STATISTICS MENDEL ANALYZED THE DIFFERENCESDIFFERENCES HE OBSERVED!
1920s. This shows a close up of the garden area. It is here that Mendel grew his peas.
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1.1. PLANT HEIGHTPLANT HEIGHT---LONG/SHORT
2.2. FLOWER POSITION ALONG STEMFLOWER POSITION ALONG STEM---AXIAL OR TERMINAL
3.3. POD COLORPOD COLOR---GREEN/YELLOW
4.4. POD APPEARANCEPOD APPEARANCE---INFLATED/ CONSTRICTED
5.5. FLOWER COLORFLOWER COLOR---PURPLE/WHITE
6.6. SEED TEXTURESEED TEXTURE---SMOOTH/WRINKLED
7.7. SEED COLORSEED COLOR---GREEN/YELLOW
PLANT CHARACTERISTICS
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HIS OBSERVATIONS:• FLOWER COLORFLOWER COLOR :
– PURPLE-FLOWERS PURPLE FLOWER– PURPLE-FLOWER WHITE-FLOWERING
• PLANT HEIGHTPLANT HEIGHT:– TALL PLANT SEEDS-->
TALL PLANTSTALL PLANTS– TALL PLANT SEEDS-->
SHORT PLANTSSHORT PLANTS
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WHYWHY DO YOU
THINK THIS HAPPENED?
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• ANTHER:ANTHER: MALE REPRODUCTIVE PART
• STIGMA:STIGMA: FEMALE REPRODUCTIVE PART
FLOWER ANATOMYFLOWER ANATOMY
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MENDEL’S METHODS
• HE CONTROLLEDCONTROLLED THE EXPERIMENT BY CHOOSING HOW THE PLANTS WERE POLLINATEDPOLLINATED.
• POLLINATION:POLLINATION:– POLLEN GRAINS FROM
ANTHERANTHER TRANSFERRED TO STIGMASTIGMA
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• SELF-POLLINATIONSELF-POLLINATION: – The transfer of pollen from the anther of a flower to
the stigma of the same flowersame flower, or to different flowersdifferent flowers on the same planton the same plant. .
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CROSS-POLLINATION:CROSS-POLLINATION:
• INVOLVES FLOWERS OF 2 2 SEPARATESEPARATE PLANTS
• THE PEA PLANT THAT MENDEL STUDIED REPRODUCED BY SELF-SELF-POLLINATIONPOLLINATION
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• 1ST: SELF-POLLINATIONSELF-POLLINATION CAN BE INTERRUPTED
• 2ND: CROSS-POLLINATIONCROSS-POLLINATION PERFORMED.
• HOW THIS IS DONE:– A) REMOVE THE ANTHER FROM A FLOWER
– B) MANUALLY TRANSFER ANTHER OF A FLOWER ON ONE PLANT TO THE STIGMA OF A FLOWER ON ANOTHER PLANT
• THIS GAVE MENDEL A CONTROLLED EXPERIMENT.
WHAT MENDEL DID…
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P1 GENERATION:– PARENTPARENT GENERATION
– MENDEL USED 14 STRAINS14 STRAINS FOR EACH OF THE 14 TRAITS HE OBSERVED
– WHEN PLANTS MATURED HE RECORDED THE NUMBER OF EACH TYPE OF OFFSPRING PRODUCED BY EACH P1 PLANT
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F1 GENERATION:• GENERATION OF
OFFSPRING OFFSPRING PRODUCED BY THE P1 PLANT
• FIRST FILIAL FILIAL GENERATION
• THESE THEN SELF-POLLINATED AND COLLECTED SEEDS
F2 GENERATION:–THE PLANTS THAT WERE PRODUCED BY THE F1 GENERATION OF PLANTS
F2
generation
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HOW COULD THESE TESTS HELP US UNDERSTAND HOW WE INHERIT OUR
TRAITS?
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DOMINANT & RECESSIVEDOMINANT & RECESSIVE• MENDEL CALLED THE
TALL HEIGHTTALL HEIGHT OF THE PLANT DOMINANTDOMINANT– B/C IT HID/MASKED OR
DOMINATED THE SHORT HEIGHT
•THE SHORTSHORT PLANT WAS CALLED RECESSIVERECESSIVE•HOW DOES THIS RELATE TO US?
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PUNNETT SQUARE• TOOL USED TO PREDICT THE RESULTS IN
GENETICS
• CAPITAL LETTERCAPITAL LETTER “AA” REPRESENTS DOMINANT DOMINANT ALLELEALLELE
• LOWERCASE LETTERLOWERCASE LETTER “aa” REPRESENTS recessive ALLELErecessive ALLELE
• LET’S DRAW AN ALLELE ON YOUR LEFT PAGE
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GENOTYPE & PHENOTYPE• GENOTYPE:GENOTYPE: THE GENETIC BLUEPRINT OR
WHAT THE LETTER (ALLELE) REPRESENTS:– “TT”– “tt”
• PHENOTYPE:PHENOTYPE: IS HOW THE ALLELE LOOKS– “TT” = TALL PLANT– “tt” = short PLANT
• HOMOZYGOUS:HOMOZYGOUS: AN ORGANISM W/22 ALIKEALIKE ALLELES FOR A TRAIT THAT ARE EXACTLYEXACTLY THE SAME (tttt OR TTTT)
• HETEROZYGOUS:HETEROZYGOUS: AN ORGANISM THAT HAS 2 DIFFERENT2 DIFFERENT ALLELES FOR A TRAIT (TtTt)
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PUNNETT SQUARE EXAMPLES
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