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Class Topics

Hand in Investigating Inherited Traits before the bell rings please Human traits "Attitude is a little thing that can make all the difference." Sir Winston Churchill.

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Class Topics

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  1. Hand in Investigating Inherited Traits before the bell rings please Human traits "Attitude is a little thing that can make all the difference." Sir Winston Churchill To assess learning about some of the aberrations to Mendelian genetics and dihybrid crosses and continue to learn about pedigree analysis Title: Biology 2/16/07 Class Topics Objectives: Wednesday, January 1, 20205:34 AM

  2. Class Assignments What By When • Investigating Inherited Traits 2/16/07 • W.S. “X marks the spot” 2/21/07 • Chapter 8 Quiz 3 2/23/07 • Due this class period • Due next class period • Due in the future

  3. Grade Sheet 2A – p. 157 (5 pts.)

  4. Links • Sex-linked Inheritance quiz • Blue People of Kentucky

  5. More about polygenic traits • Inheritance is complicated • Phenotypes vary greatly • Ex. Human skin color • Ex. Human height

  6. From: http://campus.queens.edu/faculty/jannr/Genetics/images/polygenic.gif

  7. From: http://campus.queens.edu/faculty/jannr/Genetics/images/height.jpg

  8. From: http://campus.queens.edu/faculty/jannr/Genetics/images/eyecolor.gif

  9. Traits influenced by environment • Traits determined by nutrition • Ex. Osteoporosis! • Malaria • Studied by scientists using identical twins

  10. Twins • 2 eggs + 2 sperm - fraternal • siblings - no closer genetically • 1 egg + 1 sperm - identical • same exact genome • used in genetic studies • conjoined or Siamese twins aren’t separated

  11. From: http://www.ncbi.nlm.nih.gov/books/bv.fcgi?rid=dbio.section.795 X inactivation • Lyon hypothesis • In females one X chromosome becomes inactive (randomly) • Barr Body • Allows for different phenotypes with similar genotypes • Calico cats • Ectodermal dysplasia

  12. From: http://www.ncbi.nlm.nih.gov/books/bv.fcgi?call=bv.View..ShowSection&rid=dbio.figgrp.797

  13. Calico cat: State cat of Maryland! From: http://www.thecalico.com/pictures/Pumpkin3.jpg http://www.msa.md.gov/msa/mdmanual/01glance/symbols/html/cat.html

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