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Genetics!

The study of heredity or the passing of traits from one organism to it’s offspring. Genetics!. Created by Miss Vellone for Mrs. Cannistraci’s Science. Types of Reproduction. Sexual. Asexual. Requires Two Parents Ideal for changing environmental conditions

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Genetics!

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  1. The study of heredity or the passing of traits from one organism to it’s offspring Genetics! Created by Miss Vellone for Mrs. Cannistraci’s Science

  2. Types of Reproduction Sexual Asexual • RequiresTwoParents • Ideal for changing environmental conditions • Everyone is different because we get traits from both parents, so if conditions would change certain people would still survive. • Requires One Parent • Ideal for when environmental conditions stay the same • Everyone would be a clone of the other, so if conditions changed, no one is different, so no one would survive.

  3. KEY DEFINITIONS!

  4. TRAIT • A characteristic about an organism Acquired Traits – something you learn Inherited Traits-Something you were born with

  5. Gene • Found in the nucleus and determine the traits

  6. AlleleFound in the genes and are written in pairs Dominant • the more POWERFUL allele • Written in CAPITAL LETTERS!....AA Recessive • the weaker or masked allele • Written in lower case letters!.... aa

  7. Ph Geno physical genetic enotype type • Describes traits that you see. • The makeup Genotypes are genes that are not seen; they are represented by CAPITAL and lowercase letters • Heterozygous- the alleles are different • Aa • Homozygous- the alleles are the same • AA or aa

  8. Offspring • The Baby!

  9. PUNNETT SQUARES! Parents= Homozygous Dominant x Homozygous Recessive B= Brown Hair b= Blonde Hair BB X bb b b Brown= 100% Blonde= 0% B Bb Bb B Bb Bb Predict the traits of offspring

  10. Punnett Squares Practice! Heterozygous x Homozygous Dominant Aa x AA A= No Freckles a= Freckles A A No Freckles= 100% Freckles= 0% AA A AA a Aa Aa

  11. Two Homozygous Recessive Cross B= Brown Fur b= Red Fur bb x bb b b Brown Fur= 0% Red Fur= 100% bb bb b bb bb b

  12. Two Heterozygous Cross B= Brown Eyes b= Blue Eyes Bb x Bb What are the % Phenotype= B b Brown Eyes= 75% Blue Eyes= 25% BB Bb B What is the ratio? 3:1 What are the % Geneotype= b Bb bb BB= 25% Bb= 50% bb= 25% What is the ratio? 1:2:1

  13. Heterozygous Cross Homozygous Recessive B= Black Fur b= White Fur Bb X bb b b What are the % Phenotype= Black Fur= 50% White Fur= 50% B Bb Bb What is the ratio? 1:1 What are the % Geneotype= b bb bb Bb=50% bb= 50% What is the ratio? 1:1

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