Mendel’s Work 4/12/11 Pg Know: Answer one of the following- 1. What physical traits do you have that are most like your mom? 2. What physical traits do you have that are most like your dad? 3. Do parent traits always look exactly the same in the offspring? Explain your answer.

Mendel’s Work Gregor Mendel father of Genetics Purebred- plant/animal that always produces offspring w/ same trait as parent Ex: purebred short plants always produce short plants (tt) Review ?s Who is Mendel? Discoveries

2. 2. Dominant Alleles (big letter)- trait that always shows up in offspring when present in one parent Ex: 2 tall plants= tall offspring bc tall is dominant Recessive Alleles (small letter)- trait that is always covered if a dominant allele is present Ex: 1 tall plant and 1 short plant = tall plant bc tall trait is dominant Tall (TT) Short (tt) X Tall (Tt)

Alleles (represented by letters)- different forms of a gene controls inheritance Gene- factors that control traits Hybrid- offspring w/ 2 different alleles for a trait Ex: Tall plant (TT) and short plant (tt) Tall plant (Tt)- different alleles= hybrid

Dominant Alleles- use capital letters Ex: TT or Tt Recessive Alleles- use lower case letters Ex: Tt or tt Depends on trait Ex: T = height B = black Physical characteristics Passing traits from parent to offspring Review ?s Symbols What letters are used? Traits Heredity

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