1. Title: Biology 2/20/07 Objectives: Class Topics
11/13/2018
Title: Biology 2/20/07
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
“We can never discover new continents until we have the courage to lose sight of all coasts.”
Andre Gide
Tuesday, November 13, :22 PM

2. Class Assignments Investigating Inherited Traits 2/20/07
11/13/2018
Class Assignments
What
By When
Investigating Inherited Traits 2/20/07
W.S. “X marks the spot” 2/22/07
Chapter 8 Quiz 3 2/26/07
Due this class period
Due next class period
Due in the future

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Grade Sheet
2A – p. 157 (5 pts.)

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5. More about polygenic traits
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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:

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From:

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From:

9. Traits influenced by environment
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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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11. Twins 2 eggs + 2 sperm - fraternal 1 egg + 1 sperm - identical
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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
Twins

12. From: http://www.ncbi.nlm.nih.gov/books/bv.fcgi?rid=dbio.section.795
11/13/2018
From:
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:

14. Calico cat: State cat of Maryland!
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Calico cat: State cat of Maryland!
From:

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Links
Sex-linked Inheritance quiz
Blue People of Kentucky