1. Inheritance Notes
Page 27

2. FYI Practice summarizing! Do not copy word-for-word.
If you run out of space, do NOT go to the next page. Attach a piece of paper to page 27.

3. Gregor Mendel Called the “Father of Genetics”
Studied many different characteristics of pea plants
Examples: flower color and plant height
His experiments with pea plants helped us understand how traits are inherited
He thought there was “something” in each plant that controlled its traits
That “something” is known today as genes

4. Genes Every characteristic is controlled by 2 genes
1 gene is from the mother
1 gene is from the father

5. Allele An allele is a form of a gene There are 2 possible forms
dominant or recessive
Capital letters represent dominant alleles (P, G, T)
Lowercase letters represent recessive alleles (p, g, t)

6. Dominant vs. Recessive Genes
An offspring that inherits one or more dominant genes will show the dominant trait.
Dominant genes will mask (cover up) a recessive gene.
Recessive
An offspring that inherits 1 recessive gene from 1 parent and 1 recessive gene from the other parent will have 2 recessive genes. This means that there is no dominant gene to mask the recessive trait in the offspring.

7. Phenotype
Describes an organism’s physical appearance (what the trait looks like)
Example: blue eyes, purple flower, etc.

8. Genotype
Two letters representing a gene pair
Examples: RR, Rr, or rr

9. Homozygous Genotype The prefix ‘homo’ means ‘same’
Both alleles in a genotype are the same
Both are dominant OR both are recessive
Mendel’s parent generation plants were homozygous
GG = green peas
gg = yellow peas

10. Homozygous Genotype Continued
Homozygous dominant
Both alleles are dominant
Example: GG
Homozygous recessive
Both alleles are recessive
Example: gg

11. Heterozygous Genotype
The prefix ‘hetero’ means ‘different’
The alleles in a genotype are different
One is dominant and one is recessive
Mendel’s F1 generation plants were heterozygous
Gg = green peas

12. Ticket Out the Door
Now that you’re done with your notes, complete the Inheritance Notes Ticket Out the Door.
You may look back at any of these slides and/or your notes on page 27 to complete this assignment.
When you’re done, put it in the center of your table.