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GENETICS

T. T. Tt. GENETICS. t. t. PUNNETT SQUARE. EXPECTATION. Make predictions about possible outcomes of various genetic combinations of inherited characteristics. PUNNETT SQUARE RULES. PARENT’S GENES.

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GENETICS

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  1. T T Tt GENETICS t t PUNNETT SQUARE

  2. EXPECTATION Make predictions about possible outcomes of various genetic combinations of inherited characteristics.

  3. PUNNETT SQUARE RULES PARENT’SGENES A Punnett square is a tool used to predict the possible genotypes for the offspring of two known parents. PARENT’S GENES

  4. VOCABULARY

  5. PUNNETT SQUARE • The parent’s alleles go on the OUTSIDE of the square. R R RR X rr r r

  6. HOW TO USE A PUNNETT SQUARE 1. The parent’s alleles go on the OUTSIDE of the square. 2. DROP the letters on the top into each square. R R r Rr Rr NOTE: Uppercase goes first r 3. MOVE each letter on the side into each square. Rr Rr

  7. HOW TO USE A PUNNETT SQUARE WHAT DO THE RESULTS SHOW? RESULTS: R R If R is the DOMINANTallele for Red PHENOTYPIC: 100% Red 4:0 RATIO, RED TO WHITE r Rr Rr And r is the RECESSIVE allele for White GENOTYPIC: 100% Rr 4:0 ALL Rr r Rr Rr Then, we can make predictions about the outcomes.

  8. HOW TO USE A PUNNETT SQUARE LET’S LOOK AT ANOTHER PUNNETT SQUARE AND PREDICT THE OUTCOME. WHAT ARE THE RESULTS? T t PHENOTYPIC: 75% TALL 25% SHORT 3 : 1 RATIO: TALL TO SHORT Tt T is the DOMINANTallele for tallness. TT T t is the RECESSIVE allele for shortness. GENOTYPIC: 1TT: 2Tt: 1tt 1:2:1 RATIO 25 %TT, 50% Tt, 25% tt t tt Tt

  9. PUNNETT SQUARE PRACTICE Complete Punnett Square: • Yellow is dominant (Y). • Green is recessive (y). • Father - yy • Mother - Yy • Identify the phenotype and genotype. SeedColor

  10. PUNNETT SQUARES Set up the square. Complete PunnettSquare: SeedColor • Yellow is dominant (Y). • Green is recessive (y). • Father - yy • Mother - Yy • Phenotype – • Genotype –

  11. PUNNETT SQUARES KEY Complete Punnett Square: SeedColor • Yellow is dominant (Y) • Green is recessive (y) • Father - yy • Mother - Yy • Phenotype - 50% Yellow and 50% green f. Genotype - 50% Yy and 50% yy y Y y yy Yy y yy Yy

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