1/24/17 Evolution I: adaptive evolution readings Flashcards Preview

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Flashcards in 1/24/17 Evolution I: adaptive evolution readings Deck (28):
1

species

in sexually reproducing organisms, species consist of individuals that can interbreed with each other

2

paleotnologist

scientist studying fossils to learn about ancient organisms

3

Tiktaalik

many features of fish and early tetrapods, fins contain bones forming limb - like appendage anaimal could use to move and prop itself up, discovery supports predicition that one of early species emerging from Earth's oceans 375 il years ago was ancestor of reptiles, amphibians, mammals etc

4

evolution

provides scientific explanation fr why there are so many different kinds of organisms on Earth, connections tells us how we got our traits

5

trait

physical / behavioral characterist of orgnsim

6

biological evolution

changes in traits of organisms over multiple generations

7

genetics show

DNA contains proteins

8

proteins

large molecule consist of

9

mutations

change in sequence of nucleotides in DNA can alter structure of proteins/regulate protein production

10

genes direct what

production of proteins require for growth/function of cells

11

population

groups of orgnaisms of same speices close in proximity allowing them to interbreed

12

natural selection

differential survival and repoduction of organisms as a consequence of characteristics of environemnt

13

microevoluton

changes in traits of group of organisms that dont result in a new species

14

mammals

200 millions - 250 million years ago

15

mammal group

primates appear 60 - 80 million years ago

16

theory (scientific)

comprehensive explanation of some aspect of nature supported by vast body of evidence, subject to refining, can be used to make predictions about natural events/phenomena not yet observed

17

fact

observation measurement, evidence that can be expected to occur same way under similar cirucmstances, scientific explanation testsed and confirmed so many times no other reasons to keep looking or testing

18

sceince depends on

empirical evidence (senses) and testable explanataions

19

natural selection

one of the basic mechanisms of evolution, along w/mutation, migration, genetic drift

20

evolution through natural selection is

variation in traits, differential reporudction, heredity - end result: advantageous traits win

21

fitness

describes how good a particular genotype is at leaving offspring in next gen relative to how good other genotypes are at it

22

more offspring equals

greater fitness

23

genotype fitness

depends on environment organism lives in, includes ability to survive, find mate, produce offspring

24

sexual selection

when natural selection acts on mate, finding and reproductive behavior

25

genome

all genetic info organism carries

26

allele

version of gene that might exist

27

locus

pace in DNA where gene is located

28

genotype

set of genes organisms has , can refer to entire genome

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