1. 1. Circle and label the sex chromosomes in the karyotype
1. Circle and label the sex chromosomes in the karyotype. What is the gender? Circle and label the autosomes.

2. Sex Chromosomes XY XX Chromosomes that determine gender
23rd Chromosome
Female: XX
Male: XY
Gender is determined by the male. He donates an X or a Y.
XY XX

3. Autosomes: intelligence looks athleticism
Chromosomes that are not involved in determining gender
(22 chromosomes).
Contain 28,000 genes or up to 1500 genes per chromosome.
intelligence
looks
athleticism

4. 2. Circle the abnormal chromosomes. What disorder is this?

5. Down Syndrome
Trisomy 21: Three chromosomes or part of three on the 21st chromosome.
#1 Chromosomal Disorder in humans.
Associated with low IQ, delayed growth, varied mental retardation, and common facial characteristics.
Result of non-disjunction

6. 3.

7. Pedigree
Circles=Females
Squares=Males
Shaded Shape=Passed Trait

8. Pedigree albinism Shows how a trait is passed through generations
Identifies the carriers
Geneticists target genetic disorders and traits
albinism

9. 4.

10. a a a a Aa Aa A A a Aa Aa Aa Aa aa aa
Astigmatism
a a
a a Aa Aa A A a Aa Aa Aa Aa aa aa