Parts of chromosomes can be inverted, deleted, duplicated or moved to another spot (see p. 194)
Mutagens can cause chromosome mutations
Mutagens (ex. radiation, chemicals) can cause chromosome changes
Can lead to genetic disease or death
Consequences of failed separation of chromosomes in meiosis
Failed separation = a gamete may end up with no chromosome or too many copies of a chromosomes .
Zygotes that result from these gametes rarely survive, and if they do, they will have serious genetic disorders .
Diagnosing Genetic Disorders The chromosomes of an individual can be studied Karyotype: an image that shows the number of chromosomes a person has; used to diagnose genetic disorders Down syndrome karyotype
Homework for next class:
Complete Activity 6-1D worksheet (if not completed in class)