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Heredity

Heredity. Mendel’s Findings. http://www.brainpop.com/science/cellularlifeandgenetics/heredity /. A Different Point of View. Mendel counted his peas in the 2 nd generation WHY??? Results: _____ to ______ of D to R. A Brilliant Idea. genes = set of instructions

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Heredity

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  1. Heredity Mendel’s Findings http://www.brainpop.com/science/cellularlifeandgenetics/heredity/

  2. A Different Point of View • Mendel counted his peas in the 2nd generation • WHY??? • Results: _____ to ______ of D to R

  3. A Brilliant Idea • genes = set of instructions • alleles = two forms of a gene

  4. Punnett Squares • a diagram used to predict all the possible combinations of alleles • Dominant alleles = ______ letter • Recessive alleles = ______ letter

  5. Instructions • Genotype = the inherited combination of alleles (the letters/genes) • GG, Gg, gg (seed pod color) • Phenotype = the organism’s physical appearance • Green or yellow (seed pod color)

  6. Genotype Pairings • Heterozygous – two different alleles • Bb • Homozygous - the same alleles • BB, bb • True bred • If B represents big ears and b represents little ears…what will the phenotype be of: • Bb • Bb • BB

  7. How to make a Punnett Square

  8. Practice • Create a Punnett Square using a true bred purple flower and a true bred white flower. Create a 2nd Square by self- pollinating one of the offspring:

  9. Practice Punnett Square • Predict the offspring of 2 Grey Heterozygousrats. Gray is dominant over white, which is recessive. • G = grey • g = white

  10. What is the genotype and phenotype?

  11. Practice Punnett Squares • Predict the offspring of 2 white homozygouscows. Black is dominant over white. • B = Black • b = white

  12. What is the genotype and phenotype?

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