Organism of the Day: Liger

Organism of the Day: Liger
The liger is a hybrid cross between a male lion (Panthera leo) and a tigress (Panthera tigris). Thus, it has parents with the same genus but of different species. It is distinct from the similar hybrid tiglon. It is the largest of all known extant felines.
Ligers enjoy swimming, which is a characteristic of tigers, and are very sociable like lions. Ligers exist only in captivity because the habitats of the parental species do not overlap in the wild. Historically, when the Asiatic Lion was prolific, the territories of lions and tigers did overlap and there are legends of ligers existing in the wild. Notably, ligers typically grow larger than either parent species, unlike tiglons which tend to be about as large as a female tiger.
The liger is the largest known cat in the world. Imprinted genes may be a factor contributing to huge liger size. These are genes that may or may not be expressed on the parent they are inherited from, and that occasionally play a role in issues of hybrid growth. 1
Biology
1. Organism of the Day 5
2. Quiz
3. Finish 12.1
4. Start 12.2
Short Watson/Crick Video
5. Start Homework Announcements
Due Today: Review Genetics Practice Problems/Prepare for Quiz
Due Monday: Read 12.2 and answer questions 1 ­ 3. 2
Quiz
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12.1 Notes: Identifying the Substance of Genes
FWhat are genes made of? Two experiments provided excellent evidence for _______________ being the chemical molecule of genes.
1. Griffith Experiment A. Transformation 4
12.1 Notes: Identifying the Substance of Genes
Avery repeats and extends Griffith's work
P3 stop
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12.1 Notes: Identifying the Substance of Genes
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12.1 Notes: Identifying the Substance of Genes
2. Hershey ­ Chase Experiment Turn­and­Talk
What elements are in nucleic acids? What elements are in amino acids? How could we use this to figure out what genes are composed of?
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Questions:
1. Look at the title of the book. In what ways is DNA like a how­to book?
2. How does DNA store information? 3. Why is it important that DNA can be accurately copied?
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DNAi Video
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11.2 Notes
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12.2 Notes
I. Components of DNA
1. Nitogenous Base 2. Sugar
3. Phospate group
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12.2 Notes
II. Solving the Structure of DNA
A. Chargaff's Rule 14
12.2 Notes
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11.2 Notes
II. Solving the Structure of DNA
B. Rosalind Franklin 16
11.2 Notes
II. Solving the Structure of DNA
C. Watson and Crick 17
11.2 Notes
III. The Double Helix Model
A. Antiparallel Strands
B. Base Pairing 18
Exit Question:
What are the 3 components to a DNA nucleotide? Reminders
Due Monday: Read 12.2 and answer questions 1 ­ 3. 19