1. Sex Linked Traits
Ms. Frazier
Move seats if needed

2. Objectives I can define sex linked trait
I can solve a punnett square with sex linked traits
Standard:
11) Determine the significance of and relationships between genes, chromosomes, proteins, and hereditary traits. Analyze the role of genes in determining genetic make-up, gender, and hereditary characteristics. Using systems of equations, explain the variation and distribution of genotypes and phenotypes expressed in plants and animals.

3. Color Blind Test

4. Sex Linked Trait a trait that is linked to the sex of an organism
XX = Female
XY = Male
Trait can be represented by an apostrophe

5. Sex Linked Trait * = Trait X*X XX X*Y XY X*X*
Male offspring who carry a sex linked trait usually express it because they have a X and a Y chromosome.
Female offspring who carry a sex linked trait may not express it because they have another X chromosome to express.

6. Punnett Squares and Sex Linked Traits

7. X-linked hypohidrotic ectodermal dysplasia (XHED)
A local cattle farmer wants to breed his newest Holstein heifer to his Holstein bull.
Heifer carries XHED but does not show symptoms of it.
Genotype: X’X
Bull does not carry XHED.
Genotype: XY
What is the likelihood of having a calf with XHED?
What is the likelihood of having a calf who carries XHED?
Together as class – on whiteboard

8. X-linked hypohidrotic ectodermal dysplasia (XHED)
Mother: X’X’
Father: XY
What is the likelihood of a female offspring to carry XHED?
What is the likelihood of a male offspring to carry XHED?
Alone in notebook

9. Dog Breeding Activity Expectations Directions Puppies $750 $500 $250
Stay in your seat, unless told to move
Be on task
Talk quietly within your group
You each are assigned a German Shepherd dog to breed
Some of your dogs carry the X linked trait for hemophilia
Use punnett squares to breed your dogs with the person next to you
We will have different rounds to see which breeding pairs can make the most profit on puppies
Make sure you are crossing MALE and FEMALE in your squares!
$750
XY or XX
$500
X’X
$250
X’X’ or X’Y

10. Objectives I can define sex linked trait
I can solve a punnett square with sex linked traits
I can differentiate the genotypes of males and females
Standard:
11) Determine the significance of and relationships between genes, chromosomes, proteins, and hereditary traits. Analyze the role of genes in determining genetic make-up, gender, and hereditary characteristics. Using systems of equations, explain the variation and distribution of genotypes and phenotypes expressed in plants and animals.

11. Review game Stay in your seat Talk quietly within your group
Expectations
Stay in your seat
Talk quietly within your group
Team Names

12. Basic physical and functional unit of heredity
Chromosome
Protein
Gene
Genotype

13. Gene that masks other genes
Sex Linked Trait
Dominant
Recessive
Phenotype

14. DNA Molecule packaged into thread like structures in the cell nucleus
phenotype
gene
protein
chromosome

15. The set of observable characteristics of an individual
phenotype
genotype
genes
chromosomes

16. ______ are Characteristics passed down from one generation to the next
homozygous
Sex linked traits
Hereditary traits
heterozygous

17. Diargram to determine hereditary probability
Punnet square
phenotype
Recessive gene
homozygous

18. Gene masked by other genes
proteins
genotype
Recessive gene
Dominate gene

19. Genetic makeup of an individual
Genotype
Phenotype
Punnet square
homozygous

20. Large, complex molecules that play many critical role sin the body
genes
Sex linked trait
chromosomes
proteins

21. Which of the following is homozygous dominant?Cc GG Aa zz

22. Which of the following is homozygous recessive?Cc GG Aa zz

23. Trait that is linked to the sex of an organism?
Sex linked trait
Genotype
phenotype
Amino acid

24. How do genes effect the production of proteins?

25. Draw a punnett square for the following cross: heterozygous red spots x homozygous black spots

26. Draw a punnett square for the following cross: homozygous brown eyes x heterozygous brown eyes

27. Draw a punnett square for the following cross: homozygous dominant long ears x homozygous recessive short ears

28. X-linked hypohidrotic ectodermal dysplasia (XHED)
Mother: X’X’
Father: XY
Draw a punnett square for this cross
Alone in notebook