1. Heredity and Genetics

2. Heredity and Genetics
I Can Describe the relationship among genes, chromosomes, and inherited traits.

3. Key Vocabulary

4. The inheritance of traits from parents to offspring
HEREDITY
The inheritance of traits from parents to offspring

5. GENETICS
the study of heredity

6. A characteristic that distinguishes one individual from another.
TRAIT
A characteristic that distinguishes one individual from another.

7. BrainPOP

8. Gregor Mendel Considered the “father of genetics”
An Austrian monk with a love of science
Experimented with garden peas- studying traits such as plant height, pea color, pea shape, flower color
Began his experiments in 1856
Experimented for 8 years on thousands of plants
His work was forgotten until other scientists confirmed
his findings in 1900

9. Alleles The different forms of a trait that a gene may have
Examples in pea plants include:
Short or tall plant
Red or white flowers
Green or yellow peas

10. are different forms of a gene.
is a part of a chromosome that determines a trait.
CHROMOSOME
ALLELE
ALLELES
are different forms of a gene.
ALLELE

11. Alleles
Alleles can be DOMINANT: meaning they cover up (dominate) other alleles; or they can be recessive: meaning they can be covered up or seem to disappear
The different alleles are shown by CAPITAL (DOMINANT) or lowercase (recessive) letters

12. Alleles How do you determine which allele is dominant to begin with???
For the recessive allele or form of a trait to be seen, the genotype MUST be a pure (homozygous) recessive (tt)
The dominant form will show in either pure (homozygous) dominant OR heterozygous (mixed) (TT or Tt)

13. Alleles
If the alleles are the same they are called homozygous. (also known as purebred)
Example: TT or tt
If the alleles are different they are called heterozygous. (also known as hybrid )
Example: Tt

14. Lets Assess your learning
BrainPoP Quiz