Download p 315 bio apr 28 - Buena Regional High School

Chapter 11 Complex Inheritance and Human Heredity
Section 3 Chromosomes and Human Heredity
1.
Explain how a scientist might use a karyotype to study genetic
disorders.
The karyotype might be used to determine the sex of the
individual, whether the proper number of chromosomes
are there, whether there are extra or missing chromosomal
material(s).
3. Draw a sketch to show how nondisjunction occurs during
meiosis (I & II)
http://images.slideplayer.com/21/6262073/slides/slide_34.jpg
4. Why might missing sections of the X or Y chromosome, be a
bigger problem in males than deletions (missing parts) would be
in one of the X chromosomes in females?
Males only receive one X and one Y, so missing sections could
contain genes that are vital. With females who have two X’s
deletion of one X might be made up by gene information on the
other X.
5. Create a karyotype of a female organism in which 2n=8 showing
tiresome of chromosome 3.
6. What might be the benefits of fetal testing? What might be the
risks?
Benefits-discovery of genetic problem; risk-harm to fetus or
stimulate uterus