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Survival Of The Fittest Essay

3059 words - 12 pages

Summer Reading Assignment-IB Biology SLIntroduction1."Why does evolution, allow harmful genes to persist?Chapter I2. makes the body feel achy; it's hard to complete physical activityIron overload is a hereditary disease that disrupts the way the body metabolizes ironIt damages the joints, the major organs.It can lead to liver failure, heart failure, diabetes, arthritis, infertility, and in some cases cancerIron-poor diets are the most common cause of anemia (a lack of red blood cells)3. The author compared the macrophages as being the Bruce Lee's of the immune systemCenturies ago in the west, the place to go for bloodletting was the barbershop. The barber's pole was originally a symbol for bloodletting. The bowl at the top represented the bowl for collecting blood. And the red and white spirals derive from the medieval practice of hanging bandages on a pole to dry.Chapter II4. There are two major types of diabetes, Type 1 (juvenile diabetes) and Type 2 (adult-onset diabetes) the third form of diabetes is called gestational diabetes, tends to be temporary and resolves itself after pregnancy5. The Dryas Presence in the arctic of Sweden 12,000 years ago indicated that warm weather that followed the last ice age had been interrupted by a shift back to cold weather, hence receiving the name "Younger Dryas"But really the Younger Dryas actually descended on the Northern Hemisphere much more rapidly.By the 1980's the ice cores confirmed the existence of the Younger Dryas, it also revealed that the last ice age ended in three years.6. Shivering, when shivering the body's increased muscle activity burns the sugar stored in your muscles and creates heat, next your body constricts the capillaries in your fingers and toes, then through our arms and legs.The body also has another response to cold, which is feeling the urge to urinate, through internal pressure. As blood pressure reaches the body's core, the body signals the kidneys to release extra fluid7. The wood Frog's (Rana sylvatica) body eliminates water and drives up sugar levels to deal with cold, which is similar to the disease diabetes, which is the excessive elimination of water and high levels of blood sugar.8.


Evolutionary Advantage


iron overload that include, heart failure, joint pains, liver cirrhosis, diabetes mellitus, fatigue, and darkening of skin.
Urinating frequently,
Increased thirst.
Excessive hunger
Unexplained weight loss
Irritable mood
Blurred vision

During the Bubonic plague, those with Hemochromatosis were able to withstand the illness because of their bodies Iron-filled macrophages
People with diabetes living in the ice age, were able to survive due to the high levels of sugar in the blood.

Chapter III9. Vitamin D is a n important component of the human body that ensures the growth if healthy bones in children and the maintenance of bone growth in adults, it also makes sure that our blood has sufficient levels of...

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