1. Pea In Your Genes

2. Gregor Mendel Liked to play with pea Noticed that certain Characteristics (inheritable physical features) showed up or disappeared in peas. plants.

3. Characteristics Inheritable physical features – such as yellow peas or wrinkled peas. Come from Genes – Which come from your parents. Also called Traits – could be pea color or pea shape.

4. A single trait can be expressed (shown) in different ways. Allele is the different representation of the same trait. Ex. Seed color: Yellow or Green Yellow is one Allele for Seed Color Green is another Allele

5. Genotype & Phenotype Genotype – “code” for a trait Phenotype – what you actually see. Yellow peas – Use Y to represent Yellow Green peas – Use y to represent Green

6. Yellow and Green Peas GenotypePhenotype YY – Yellow Yy – Yellow yy - Green

7. Three different Genotypes but Two Colors. Why? YY – Yellow Yy – Yellow yy - Green Dominant Allele – rep. by a capital letter – Y Recessive Allele – rep. by a lowercase letter - y Dominant Alleles OVER POWER Recessive Alleles

8. YY – Homozygous Yellow Yy – Heterozygous Yellow yy – Homozygous Green

9. How do alleles pass from parent to child? Punnett Squares What if you cross a Homozygous Yellow Pea (YY) with a Homozygous Green Pea (yy)? 100% Heterozygous Yellow Peas

10. 25% Homozygous Yellow 50% Heterozygous Yellow 25% Homozygous Green