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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