1. Incomplete dominance and codominance Dec 13 & 14
Please get:
Journal
Handouts
Karyotype grid and Chromosomes

2. Gametes, with only _____ of each chromosome pair are _________.
Warm up for Dec. 13 & 14
Body cells, produced by the process of ______, are ______. This means that they have 2 of each chromosome.
Gametes, with only _____ of each chromosome pair are _________.
Gametes are produced by the process of _________.

3. Gametes, with only half of each chromosome pair are haploid.
Warm up review
Body cells, produced by the process of mitosis, are diploid. This means that they have 2 of each chromosome.
Gametes, with only half of each chromosome pair are haploid.
Gametes are produced by the process of meiosis.

4. PATTERNS OF INHERITANCE
KEY CONTENT:
PATTERNS OF INHERITANCE
LEARNING TARGET:
I CAN WORK OUT PROBLEMS THAT SHOW VARIOUS PATTERNS OF INHERITANCE

5. MENDEL WAS LUCKY…..
or just really smart?!

6. Mendel Was Lucky...or just really smart?!
The pea traits that Gregor Mendel selected exhibited simple dominance. We now understand that inheritance is rarely so simple!! What follow are some other ways that traits can be passed on.

7. NOTES: Incomplete Dominance
The dominant allele is only weakly dominant over the recessive allele.
Example:
RR = red flowers
rr = white flowers
but Rr = pink flowers!

8. NOTES: Co-dominance
The alleles for a gene are equally dominant and both are expressed in the phenotype. Example: B = brown fur W = white fur BW = fur composed of BOTH brown and white hairs.

9. Incomplete vs. Co-dominance

10. Co-dominance
Another example of co-dominance is the gene that controls human blood type.
Allele A is co-dominant with allele B.
Both A and B are equally dominant
over a 3rd allele, o.
There are 4 human blood types….what are the phenotypes and genotypes for each??

11. Co-dominance PHENOTYPE GENOTYPE (S) TYPE A AA OR AO TYPE B BB OR BO
TYPE AB AB
TYPE O OO

12. Abo blood type

13. NOTES: Sex-linked Traits
Some genes are located on the sex chromosomes (usually the X) and therefore have special inheritance patterns.
Examples of X-linked recessive genes are:
Red-green colorblindness
Hemophilia
Fruit fly eye color

14. Sex chromosome maps

15. Sex chromosome maps

16. Sex-linked Traits Colorblind Example: XX = female; XY = male
XNXN = non-colorblind female
XNXn = carrier* female
XNY = non-colorblind male
XnXn = colorblind female
XnY = colorblind male
NOTES:
*Carrier: This is a person who carries the recessive gene but it is not expressed. This person has the ability to pass on the recessive gene to their offspring.

17. Complete your karyotype grid
Check your chromosome smear with the normal karyotype to determine which chromosomal disorder is represented.
Complete the Chromosomal Disorder Report…you may need to use a laptop to go online to find more information. Be prepared to report to the class.
Complete your genetic problems packet
Complete the genetic problems packet. Due next class.