Week8a+Summary,+KEY

Here is my summary of your responses on Week 8.


 * 1. Six fingers is dominant over five fingers, which is recessive. WHY do you think most people have five fingers and not six?**

If there is a reason, or a rational why a certain trait exist, it is not because it is inherited (other, oposing traits would also be inhereited!), and not because it is recessive or dominant (which is only describing the mode of inheritance, without relevance to the value for survival). The rational will have to do either with circumstances such as isolation (will be discussed next week) or with increasing chances to raise offspring. In case of the five/six fingers, we can rationalize that five fingers have an advantage for survival, or that simply six fingers are not as attractive for mating in the major populations of the world. Both explanation woudl result in greater chance to raise offpsring if one has five fingers. Another popular, but wrong explanation, was that "5 fingers are the most common, and therefore are the most common..". If six fingers were better survivors or admired by the 5-fingered - wouldn't their rate in the population increase over time?

//**The following students are getting extra 10 points for this question, for being on the right track:**// //**Per2LouisaC, Per2SunnyS, Per2JachelleA, Per2PattyC, Per2ChristinaM, Per5FrancisF, Per6RosaR. CONGRATULATIONS!**//

//Here you posted such wonderfully varied questions,it is hard to read them all and choose! I will give it a try. Thos posted here are types of natural selection questions:// - Why do zebra have stripes and the horses and donkey have a solid color? - How is it that dogs have such a good sense of smell and how would that be? did one type of dog mate with another dog with a good sense of smell? - Why is that in some bushes of red roses, other colors of roses seem to grow? Also, sometimes, a different flower grows. - Why do snakes continue to have no arms or legs? - Why do penguins have wings, if they don't use them to fly? - Why is it that flamingos have such long and thin legs?, that are useless they don't really need them. - Why do bees have stingers? Were they inherited to be used as a defense mechanism against predators? If so, then why do bees die when they sting a person? - How did the Eagle receive its great eyesight? - Why do human males have nipples? Women seem to be the only one who use their nipples for survival (for breastfeeding their children) yet men have them. So why? - Why does a zebra have stripes?\ - If an ostrich is considered a bird, then why can't it fly? - Why do bats have a low tolerance to daylight? - Ducks have a very fine shape to help them be boyant in the water so they will not sink. How would their ancestors have looked thousands of years ago when they first started fishing for their food ? - Why do the tails of lizards grow back once it is cut off? Is the tail vital for their survival or reproduction, and if so, how exactly does the tail grow back? - Why do hedgehogs have quills, if the quills are dull, and the only way they would actually hurt you is if you were to push them into your skin? (like push hard into them.) - Why do most people believe we evolved from Monkeys yet they are still around ? if we did wouldn't they have disappeared years ago ? (Per2CindyM: Although this question is from a different perspective, it was unique, and I did not want to miss it. My ansawer: we did not really evolve from monkeys. Monkeys and us came from a relatively recent common ancestor. That is not contradicting the current existance of both types of speices) -Why is it that fllamingos have wings when they dont even fly? - Why can't we, humans produce venom like snake? Why can't we change color of our skin, with our emotion, like few can change the color of their eyes? - Why are there "amphibians"? Where did they start to be like that,in the first place? - why do centipedes have many legs but have no eyes. or if the ones that do have eyes why do they still have poor eye sight.? why cant they see well.? - Why is it that in the winter snow rabbits shed their fur and turn compl etely white like the snow around them? How is this helpful for them? - Why is it that not all frogs are the same color? What makes them adapt to different enviorments? - Why do bears have sharp teeth?
 * 2. Here YOU need to make up a biological question of a WHY type about any inherited trait of an organism that you choose, __plant__, animal, bacteria, fungi, etc**.
 * -** Why does the Redtailed hawk have wide wings and then on the other hand, The Pergrine Falcone has narrow wing tips?


 * 3. Make an attempt to answer the question that a student before you posted.**
 * NO REPEATS.
 * IDK is not an answer! And write in FULL SENTENCES.
 * Write the username of the student whose question you are answering.
 * If you are one of the first 10 to post, you need to wait a little for this question.