SCI 9 Lesson 2 Mar 17 - Introduction to Genetics (2)

HOMEWORK FROM LAST CLASS: ,[object Object],[object Object]

INTRODUCTION TO GENETICS - REVIEW

[object Object],[object Object],[object Object],Pea 

VOCABULARY REVIEW Match the following vocabulary words to the correct number. _________ trait ,[object Object],_________ recessive 2. A physical feature resulting from a genotype _________ heredity 3. A form of a gene _________ genotype 4. The combination of alleles for a trait; represented by 2 letters _________ phenotype 5. The study of heredity _________ dominant 6. The passing of traits from parent to offspring _________ gene 7. An allele that gets masked so it cannot be expressed (unless it is paired with its counterpart allele) _________ allele 8. A characteristic or feature of an organism that can be passed from parent to offspring _________ genetics 9. An allele that masks another, and is always expressed in the phenotype

VOCABULARY REVIEW - ANSWERS Match the following vocabulary words to the correct number. 8 trait ,[object Object],7 recessive 2. A physical feature resulting from a genotype 6 heredity 3. A form of a gene 4 genotype 4. The combination of alleles for a trait; represented by 2 letters 2 phenotype 5. The study of heredity 9 dominant 6. The passing of traits from parent to offspring 1 gene 7. An allele that gets masked so it cannot be expressed (unless it is paired with its counterpart allele) 3 allele 8. A characteristic or feature of an organism that can be passed from parent to offspring 5 genetics 9. An allele that masks another, and is always expressed in the phenotype

INCOMPLETE DOMINANCE ,[object Object],[object Object],[object Object],[object Object],[object Object]

INCOMPLETE DOMINANCE Neither the red gene (R) nor the white gene (W) is dominant. When the 2 genes are present in the same plant, a pink flower results. Both R and W are used (capital letters) because neither the red gene nor the white gene is dominant over the other. White Red

GENETIC PRINCIPLES ,[object Object],[object Object],[object Object],Parent generation (P1) 1 st filial generation (F1) 2 nd filial generation (F2)

GENETIC PRINCIPLES ,[object Object],[object Object],[object Object],[object Object]

PROBABILITY ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

PROBABILITY F1 cross (Bb x Bb) What percentage of offspring are purebred purple ? 25% (1/4) What percentage of offspring are hybrid purple ? 50% (2/4) What percentage of offspring are purebred white ? 25% (1/4)

PROBABILITY F1 cross (Bb x Bb) What percentage of offspring have the same genotype as the parents? 50% (2/4) What percentage of offspring have the same phenotype as the parents? 75% (3/4)

INSTRUCTIONS ,[object Object],[object Object],[object Object],[object Object],[object Object]

GREGOR MENDEL’S PUNNETT SQUARES ,[object Object]

HOMEWORK FOR NEXT CLASS: ,[object Object],[object Object]

WORKS CITED ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

SCI 9 Lesson 2 Mar 17 - Introduction to Genetics (2)

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