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Jumpstart 12/5
For each of the genotypes presented below,
determine all of the possible haploid gametes.
a. Rr
b. RrYy
c. RrYyBb
2. A woman is color blind. What are the
chances that her sons will be color blind?
If she is married to a man with a normal
vision, what are the chances that her
daughters will be color blind? Will they be
Human Traits, continued
 Genetic
counselors analyze how the trait
is passed from one generation to the next.
They construct pedigree charts that show
the pattern of inheritance for a particular
condition, and show if a disorder is
dominant or recessive.
Pedigree Chart
How many generation are there in this pedigree?
How are females represented? Males?
What does the shading show?
Half shaded?
What do the horizontal lines indicate? Vertical?
Could you tell the genotypes of the people?
Genetic Disorders
 Autosomal
( non-sex linked) Dominantindividuals with alleles AA or Aa will have
the disorder.
Recessive – individuals with
alleles aa with have the disorder.
 Autosomal
Autosomal Disorders
 Do
you remember what an autosome
Autosomal Dominant Disorders:
- Dwarfism known as achondroplasia
- Huntington’s disease
Autosomal Recessive Disorders:
- Phenylketonuria ( PKU)
- Tay-Sachs disease
- Cystic Fibrosis
- Albinism
Incompletely dominant disorders:
- Sickle-Cell disease
Ways to recognize autosomal
dominant disorders:
Affected children usually have an affected
 Two affected parents can produce an
unaffected child.
 Two unaffected parents will not have
affected children.
Inheritance Pattern I:
Ways to recognize autosomal
recessive disorders:
Most affected children have normal parents.
 Two affected parents will always have
affected children.
 Affected individuals with homozygous normal
mates will have normal children.
Inheritance Pattern II:
Dominant or recessive?
Dominant or recessive?
Dominant or recessive?
Dominant or recessive?
Sex – Linked Pedigrees
– linked (ONLY males will inherit)
Male infertility
– linked
Red/Green Color Blindness
Muscular dystrophy
Pedigree Analysis
Activity: Creating and Analyzing a Pedigree
1. Get into your groups as indicated below:
1. 1, 21, 6
2. 2, 22, 17, 12
3. 3, 8, 10
4. 7, 5, 19, 20
5. 4, 14, 18
6. 11, 16, 27, 30
7. 9, 26, 12, 24
8. 23, 29, 13
9. 15, 25, 28
2. Read the instructions and complete. Do in
pencil first! Think, think, think!
3. Due at the end of the period!