Natural Selection

فهرست عناوین اصلی در این پاورپوینت

فهرست عناوین اصلی در این پاورپوینت

● Natural Selection
● Problem the First
● The Second Problem
● The Third Problem
● The Solution!
● How’s it work?
● How’s it Work?
● This lecture keeps evolving…..
● Different types of selection
● Different kinds of selection
● Other Evolutionary Theories
● Silly incorrect evolutionary theories and ideas
● Still another silly idea

نوع زبان: انگلیسی حجم: 0.83 مگا بایت
نوع فایل: اسلاید پاورپوینت تعداد اسلایدها: 17 صفحه
سطح مطلب: نامشخص پسوند فایل: ppt
گروه موضوعی: زمان استخراج مطلب: 2019/05/10 01:21:27

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عبارات مهم استفاده شده در این مطلب

عبارات مهم استفاده شده در این مطلب

selection, ., ‘, `, different, …, problem, do, natural, think, thing,

توجه: این مطلب در تاریخ 2019/05/10 01:21:27 به صورت خودکار از فضای وب آشکار توسط موتور جستجوی پاورپوینت جمع آوری شده است و در صورت اعلام عدم رضایت تهیه کننده ی آن، طبق قوانین سایت از روی وب گاه حذف خواهد شد. این مطلب از وب سایت زیر استخراج شده است و مسئولیت انتشار آن با منبع اصلی است.

http://people.auc.ca/brodbeck/3906/nat_3906.ppt

در صورتی که محتوای فایل ارائه شده با عنوان مطلب سازگار نبود یا مطلب مذکور خلاف قوانین کشور بود لطفا در بخش دیدگاه (در پایین صفحه) به ما اطلاع دهید تا بعد از بررسی در کوتاه ترین زمان نسبت به حدف با اصلاح آن اقدام نماییم. جهت جستجوی پاورپوینت های بیشتر بر روی اینجا کلیک کنید.

عبارات پرتکرار و مهم در این اسلاید عبارتند از: selection, ., ‘, `, different, …, problem, do, natural, think, thing,

مشاهده محتوای متنیِ این اسلاید ppt

مشاهده محتوای متنیِ این اسلاید ppt

natural selection or how did we get here…. natural selection the theory of natural selection is so simple that anyone can misunderstand it…. anonymous charles darwin ۱۸ ۹ ۱۸۸۲ saw three problems in need of a solution. darwin was not the only one to see these problems btw other ‘naturalists’ were struggling with the same issues problem the first there is change over time in the flora and fauna of the earth what we would commonly call ‘evolution’ today the fossil record showed this to be pretty clear even to people in the mid ۱۸ s this was not controversial in darwin’s time and is not now. the second problem there is a taxonomic relationship among living things people were big into classifying stuff it was pretty obvious that there was a relationship between different species different birds different grasses different cats etc the third problem adaptation different kinds of teeth for different animals say carnivore ripping teeth and herbivore grinding teeth different tissues within species heart vs. eye etc. the solution natural selection provides a mechanistic account of how these things occurred and shows how they are intimately related. it is one of those ‘oh man is that ever easy why didn’t i think of that ’ type things. how’s it work there is competition among living things more are born or hatched or whatever than survive and reproduce reproduction occurs with variation this variation is heritable remember there was no genetics back then chuck knew he just knew…. realized that is wasn’t ‘blending’ how’s it work selection determines which individuals enter the adult breeding population this selection is done by the environment those which are best suited reproduce they pass these well suited characteristics on to their young how’s it work reproduction is the key not merely survival if you survive to be ۱۲۸ but have no kids you are not doing as well as i am i have reproduced… assuming the traits that made me successful will help them then i amore fit now than the ۱۲۷ year old guy this lecture keeps evolving….. survival of the fittest which chucky d never said means those who have the most offspring that reproduce so the answer to the trilogy of problems is ‘descent with modification from a common ancestor not random modification but modification shaped by natural selection’ different types of selection directional selection what most of us think about when we think about selection an extreme value is selected for human brain size is a nice example different kinds of selection stabilizing or normalizing selection the middle is selected for many examples here symmetry two eyes different kinds of selection disruptive selection extremes are selected for might be where the two sexes come from trait was probably gamete sized two ‘mating types’ other evolutionary theories lamarckism inheritance of acquired characteristics e.g. giraffes really wanted leaves so they stretched their necks and….. sounds crazy but a lot of people think this way ‘we will all have giant heads and tiny bodies someday’ ‘cave swelling fish don’t use their eyes so they disappear’ ‘we don’t use our appendix so it is disappearing’ silly incorrect evolutionary theories and ideas orthogenesis there is some plan to evolution. no wrong incorrect thanks for playing the idea of an ‘evolutionary ladder’ fits in here it is wrong too…… still another silly idea intelligent design just creationism with a fancy name god does not belong in a science class any more than experiments belong in church not a scientific theory …

کلمات کلیدی پرکاربرد در این اسلاید پاورپوینت: selection, ., ‘, `, different, …, problem, do, natural, think, thing,

این فایل پاورپوینت شامل 17 اسلاید و به زبان انگلیسی و حجم آن 0.83 مگا بایت است. نوع قالب فایل ppt بوده که با این لینک قابل دانلود است. این مطلب برگرفته از سایت زیر است و مسئولیت انتشار آن با منبع اصلی می باشد که در تاریخ 2019/05/10 01:21:27 استخراج شده است.

http://people.auc.ca/brodbeck/3906/nat_3906.ppt

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