Question 16
Explain the organization of genetic information in a eukaryotic chromosome and discuss how this organization contributes to the continuity and variability of the genetic information? [pages 354-356, chapter 15]
Eukaryotic
Chromatin Structure (read pages 354-356)
- Chromatin
structure is based upon successive levels of DNA packing.
Relating
Medelism to Chromosomes (read pages 269-276)
- Mendelian
inheritance has its physical basis in the behavior of chromosomes during
sexual life cycles.
- Morgan
traced a gene to a specific chromosome.
- Linked
genes tend to be inherited together because they are located on the same
chromosome.
- Independent
assortment of chromosomes and crossing over produce genetic
recombinatants.
- Geneticists
can use recombination data to map chromosome’s gene loci.
Sex Chromosomes
(read pages 276-279)
- The
chromosomal basis of sex varies with the organism.
- Sex-linked
genes have unique patterns of inheritance.
Errors and
Exceptions in Chromosomal Inheritance (read pages 279-284)
- Alterations
of chromosome number or structure cause some genetic disorders.
- The
phenotypic effects of some mammalian genes depend on whether they were
inherited from the female or the male (imprinting).
- Extranuclear genes exhibit a non-Mendelian pattern of inheritance.
|
John C. Murphy |
Science |
|
Phone: (815) 436-3200, ext. 2120 |
|
|
jmurphy@learningcommunity202.org |
|
© 2001 Plainfield Community Consolidated School District 202.