Transcript Class Topics - Seneca High School

7/18/2015
Title:
Biology
2/16/07
Objectives:
To assess learning about some of the aberrations to
Mendelian genetics and dihybrid crosses and continue to
learn about pedigree analysis
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
Saturday, July 18, 2015 1:47 AM
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Class Assignments
What
• Investigating Inherited Traits
• W.S. “X marks the spot”
• Chapter 8 Quiz 3
By When
2/16/07
2/21/07
2/23/07
• Due this class period
• Due next class period
• Due in the future
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Grade Sheet
Assignments
Your
score
Points
possible
Your
total
score
Total
points
possible
Chapter 8 Quiz 1
38
282
Genetics W.S
20
302
Probability and dihybrid crosses
W.S.
10
312
Chapter 8 Quiz 2
39
351
Pedigree lab
10
361
Interpreting Information in a
pedigree
10
371
W.S. 8.2
10
381
Percentage
grade
2A – p. 157 (5 pts.)
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Links
• Sex-linked Inheritance quiz
• Blue People of Kentucky
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More about polygenic traits
•
•
•
•
Inheritance is complicated
Phenotypes vary greatly
Ex. Human skin color
Ex. Human height
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From: http://campus.queens.edu/faculty/jannr/Genetics/images/polygenic.gif
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From: http://campus.queens.edu/faculty/jannr/Genetics/images/height.jpg
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From: http://campus.queens.edu/faculty/jannr/Genetics/images/eyecolor.gif
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Traits influenced by environment
• Traits determined by nutrition
– Ex. Osteoporosis!
• Malaria
• Studied by scientists using identical
twins
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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
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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
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From: http://www.ncbi.nlm.nih.gov/books/bv.fcgi?call=bv.View..ShowSection&rid=dbio.figgrp.797
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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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