FELIZ NAVIDAD!!

Hopefully you are not checking this site on your vacation! Go relax! But just in case..

Have a very merry Christmas with your family and friends! See you in the new year!

Unit Test: Evolution

• format: modified true-false, multiple choice, short answer

Macroevolution

POLYPLOIDY

• polyploidy is the condition that exists when an organism has one or more extra sets of chromosomes, as a result of errors in cell division
• this often leads to sympatric speciation

ADAPTIVE RADIATION

• a process characterized by periods of isolation and dispersal
• this example of allopatric speciation usually occurs when there are new areas for a species to occupy, after mass extinctions, or when natives have not colonized an area
• i.e. galapagos islands, hawaiian archipelago

POLYMORPHISM

• polymorphism is when 2 or more forms of a phenotype are represented in high enough frequencies to be readily noticeable
• a balanced polymorphism is when the frequences of the characteristics remain fairly constant over time
• a transient polymorphism is one that is changing in frequency over time
• i.e. if a population with a high incidence of sickle cell anemia moves to a location where malaria is no longer present...the gene will begin to disappear

Human Evolution

• the following website will assist you in completing the worksheet
• Becoming Human

Unit Test: Evolution

• your test for this unit will take place on Friday, December 19th
• it will include the following sections of the IB curriculum guide:
• 5.4 Evolution. Option D: Evolution, including D1 Origin of life on Earth, D2 Species and Speciation, D4 The Hardy-Weinberg Principle, and D3 Human Evolution
• Format: true-false, multiple choice, problem solving, short answer

Natural Selection Lab: Breeding Bunnies

• please submit your lab on Monday, December 1st
• include the following sections:
  Hypothesis, Data and Observations, Data Analysis, Conclusion and Evaluation

Flashy Fish simulation

• to complete this activity, please ensure you have the 2 handouts from your teacher
• then, click on the following link: Flashy Fish

Graphing Tutorial

• a bit rusty with your graphing skills? here is a tutorial to help you:
• Graphing With Excel

Natural Selection Lab: Breeding Bunnies

• please submit your lab on Monday, December 1st
• include the following sections:
• Hypothesis, Data and Observations, Data Analysis, Conclusion and Evaluation

Natural Selection Questions

• please complete the questions on the handout distributed in class today

Hardy Weinberg Practice Quiz

• take the practice quiz and see just how much you know!

Hardy-Weinberg practice and solutions

• Here are the answers to #3 on page 650 from your text:
• a) i) SA 0 0.6 and SB 0 0.4 (because if mating is random, the frequencies shouldn´t change)
• ii) SASA =0.36 x 175 = 63, SASB = 0.48 x 175 = 84 individuals, SBSB = 0.16 x 175 = 28 individuals
• b) i) they have misshapen red blood cells which cannot properly bind oxygen, therefore they have very little energy
• ii) The allele remains in the population because of the heterozygous advantage, which means that heterozygotes for sickle cell anemia are protected against malaria.
• c) i) Sickle cell anemia is caused by a point mutation, affecting only one base! This mutation is located in the gene that codes for hemoglobin.
• ii) Due to independent segregation, there is 50 percent chance that a heterozygote will pass on the sickle cell allele to their offspring.
• d) don´t worry about part d yet..we will cover the topic of directional selection in a future class

Hardy-Weinberg Quiz

• you will have a quiz on hardy weinberg problems on Thursday of next week

Primary Abiogenesis

• here is an animation and narration of the famous Urey-Miller experiment

Reminder: Concept presentations

• don´t forget that the deadline for your concept presentations is approaching quickly
• the rubric for evaluating these presentations was distributed in class today: please use this rubric as a guide when preparing your final presentation

The Respiratory System

• read text pages 165 to 174
• remember that you have a unit test next week!!

Blood Flow Through the Heart

• check out the following animation on blood flow through the heart

The Circulatory System

• read text 231-240
• do page 247 #1,4
• Check out the animation of Blood Flow through the Heart

concept presentations

Here are some suggested topics for your presentations. Your presentation will be approximately 5-7 minutes long. You may use visual aids with labelled diagrams, but NO SENTENCES. You may not use any notes during your presenation. Creativity is encouraged.

• dialysis
• how lie detectors work
• organ transplants
• allergies
• insulin pumps
• advanced drug delivery systems
• biological warfare
• multiple sclerosis
• SCID
• MRI
• birth control pills
• anabolic steroids
• Bright's disease
• epilepsy
• artificial painkillers
• prions
• monoclonal antibodies

Unit Test: Human Health and Physiology

• this test will cover the following topics on the IB Syllabus
• 6.1 (Digestion), 6.2 (the transport system), 6.4 (Gas exchange)
• it will be split into two parts
• the first part will take place on Thursday October 30th, and the second part will take place on Monday November 3rd
• format: multiple choice, short answer, diagram, TBA

Digestion

• Digestion animation
• Digestion animation II

Thermoregulation

• click on the following animation and continue until it says ¨The End¨
• Thermoregulation

HIV

• read the notes on HIV below, and take the following quiz on HIV
• Human Immunodeficiency Virus
• HIV is the virus that leads to AIDS
• HIV is a retrovirus that contains RNA, and uses reverse transcriptase to copy its genome into DNA
• the viral DNA is then incorporated into the host DNA
• HIV infects Helper T lymphocytes (a type of white blood cell) which have the CD4 protein on their surface
• to a lesser extent, it also attacks any other immune cell that has the CD4 protein
• the virus contains an envelope that binds to CD4 proteins, resulting in receptor-mediated endocytosis in which the host cell engulfs the virus
• in transcribing and translating the viral genes, the host cell reproduces the virus, and it buds out of the cell to infect other cells
• the Helper T lymphocytes are disabled and destroyed, often with no symptoms, causing a significant decrease in levels of these cells
• gradual deterioration of the immune system and the destruction of the lymphoid organs triggers the immunosuppression that leads to AIDS
• Acquired Immunodeficiency Syndrome (AIDS) is the final stage of HIV infection
• one of the signs of AIDS is opportunistic infections, which take advantage of the body´s weakened immune system and lead to premature death

Immunity

• read text pages 319-329 and do p. 344 # 1, 3

Unit Test: Homeostasis

• the unit test will take place on Friday October 3rd
• the following topics on the IB syllabus will be covered:
• 6.5 (Nerves, Hormones and Homeostasis) - 15 questions (nerves), 6 questions (hormones and homeostasis)
• 6.6 (Reproduction) - 5 questions
• 6.3 (Defence against infectious disease) - 5 questions
• Test format: multiple choice, short answer, data analysis, modified true/false (in which the statement must be corrected if it is false)
• note: some questions will be taken directly from the IB syllabus

Endocrine Quiz

• there will be a quiz on the Endocrine system (all topics relating to hormones) on Monday September 29
• format: multiple choice, matching, short answer
• hormones you should know: insulin, glucagon, estrogen, progesterone, LH, FSH, thyroxin, TSH, TRH, epinephrine, oxytocin, GnRH

Female Reproductive Hormones

• check out the following animation and complete the self-quiz on the Female Reproductive Hormones

Synapses

• check out the following animation of synapses

Reflex Arcs and Electrochemical Impulses

• check out the following animation of Reflex Arcs
• check out the following animation of Electrochemical Impulses
• do text page369 #1, 2, 3

Overview of the Nervous system

• complete the following module on the Nervous System
• read text pages 350-359

The Nervous System

• read text pages 345-349 and do #1 a
• here is an animation of the Thyroid Hormones

Blood Glucose Regulation

• if you are already stressed out from school, and need to relax, click on the Singing Horses

Homeostasis

• read the text pages 376 and 377, and do page 378 #1, 4, 5
• animation of the action of epinephrine on a target cell

The Endocrine System

• TONIGHT´S HOMEWORK:
• check out the following notes on the Endocrine System (read all 3 sections and do the quiz at the end)
• read text pages 370 to 375 and do page 379 # 2 and 3
• OPTIONAL REVIEW: cell structure and function
• OPTIONAL REVIEW: membranes and transport