Understanding Gregor Mendel's Theory of Heredity
This article explores the work of Gregor Mendel, the Austrian monk who proposed the theory of heredity. Mendel’s experiments with pea plants helped him discover dominant
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About Understanding Gregor Mendel's Theory of Heredity
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Slide1Genetics N’ Stuff
Slide2Who Came Up with This?• Gregor Mendel • Proposed theory of heredity – Traits are passed from parents to offspring
Slide3Heworked with pea plants short tall
Slide4Why did the tall overridethe short? • Dominant= trait that is bossy • Recessive= trait that gets masked
Slide5Section 10.1 Summary – pages 253-262T T T T t t t t Tall plant Short plant All tall plants • tall plant passes on “T” allele = letter • dominant over “t” allele
Slide6Why does each traithave 2 letters? • A letter is passed from each parent • Hello! Heredity
Slide7•Homozygous - 2 same size letters HH or hh • Heterozygous = different size letters Hh
Slide8If I have genotype Ww,and W=round snoot and w=pointy snoot, what will my phenotype be? Physical trait= round snoot!!
Slide9•Phenotype = physical trait • Genotype = letters or alleles
Slide10Let’s do an example witha punnett square!
Slide11If there are only browndominant chickens and white recessive chickens, how could you get a red chicken? Incomplete dominance
Slide12•Incomplete= 2 phenotypes mix to make a medium trait • Codominance= when both phenotypes show up – Example= blood type
Slide13But what about height?There are way more than 2 or 3 sizes of person! P o l y g e n i c T r a i t s
Slide14Polygenic Traits• More than one allele controls it • Examples: height,
Slide15Traits can also be linked by9sex • Only boys get color blindness • Hemophilia