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caused by

include include include

Autosomol Disorders

Recessive alleles

Dominant alleles

Codominant alleles

Albinism Galactosemia Tay-Sachs disease

Huntington’s disease

Sickle cell disease

Cystic fibrosis

Phenylketonuria Achondroplasia Hypercholes- terolemia

A circle represents a female.

A square represents a male.

A horizontal line connecting a male and female represents a marriage.

A vertical line and a bracket connect the parents to their children. A half-shaded

circle or square indicates that a person is a carrier of the trait. A completely

shaded circle or square indicates that a person expresses the trait.

A circle or square that is not shaded indicates that a person neither expresses the trait nor is a carrier of the trait.

Phenotype (Blood Type) Genotype

Antigen on Red Blood Cell

Safe Transfusions To From

1. What is a pedigree? 2. In a pedigree, females are

represented by what? Males? 3. In a pedigree, how is a carrier

represented? 4. What are the four blood types? 5. List the blood types in order from

most common to least common.

X

X X

X

X X X

Y

Y

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Homologous chromosomes fail to separate

Meiosis I: Nondisjunction

Meiosis II

Father (normal vision)

Colorblind Normal vision

Mother (carrier)

Daughter (normal vision)

Son (normal vision)

Daughter (carrier)

Son (colorblind)

Male

Female

http://colorvisiontesting.com/ishihara.htm

1. What is nondisjunction? What does it cause?

2. What is a sex-linked trait? Give an example.

3. How are sex-linked traits passed on?

4. Explain crossing over.

A duplication occurs when part of a chromosome is copied (duplicated) abnormally, resulting in extra genetic material from the duplicated segment

Translocation is a chromosomal disorder in which a fragment of a CHROMOSOME breaks from its original chromosome and attaches itself to a different chromosome.

A deletion occurs when a chromosome breaks and some genetic material is lost.

In this example, one nucleotide (adenine) is added in the DNA code, changing the amino acid sequence that follows

Inversions occur when a chromosome breaks in two places and the resulting piece of DNA is reversed and re-inserted into the chromosome.

1. What is duplication? 2. What is translocation? 3. What is a deletion? 4. What is an insertion? 5. What is an inversion?

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