1. Genetics

2. Examples in real life

3. What does homo mean?

4. Terms to know: Trait Gene Heredity Allele Recessive Dominant
Homozygous
Heterozygous
Genotype
Phenotype

5. Passing of from one generation to the next.
Heredity
Passing of from one generation to the next.
TraitS

6. Inherited forms of a characteristic.
TraitS
Inherited forms of a characteristic.
Examples: Flower color,
Eye color, hair color, etc.

7. Traits
All must have at least
Genes
One from each parent.

8. Genes? Blonde hair Brown hair Blue eyes Green eyes
Remember: 2 genes for each TRAIT

9. Allele Different forms of each gene Blonde hair (blonde allele)
Brown hair
(brown allele)

10. Sometimes one gene overpowers the other.
Dominant
Recessive
Sometimes one gene overpowers the other.

11. Dominant Gene overpowers the recessive gene Always shows up if present
Gene designated by captial letter
Ex: D

12. Recessive
gene that gets overpowered
Only shows up if 2 recessive genes are present
gene designated by lower case letter
Ex: d

13. the genes of a pair are different Ex: Dd
Heterozygous
the genes of a pair are different
Ex: Dd

14. the genes of a pair are the same Ex: DD or dd
Homozygous
the genes of a pair are the same
Ex: DD or dd

15. The animal has the same genes for the trait.
What did homo mean?
The animal has the same genes for the trait.

16. The actual gene combination Ex: DD Dd dd
Genotype
The actual gene combination
Ex: DD Dd dd

17. The physical appearance Ex: Black Black Red
Phenotype
The physical appearance
Ex: Black Black Red

18. This knowledge can be used to manage or predict physical outcomes.

19. Use a Punnet Square

20. Example: Tongue rolling is dominant (T)
No tongue rolling is recessive (t)
Cross 2 heterozygous people: Tt T t TT Tt Tt tt

21. Genotype 1 2 1 T t TT Tt tt # of homozygous rollers
# of heterozygous rollers 2
# of homozygous non rollers 1

22. TT Tt tt
Phenotype
# of rollers 3 1
# of non rollers

23. Review Dominant overpowers Recessive Homozygous - PP pp
Heterozygous – Pp
Genotype – the genes
Phenotype - appearance