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Biology > Natural Selection Chapter #2 > Flashcards

Natural Selection Chapter #2 Flashcards

1
Q

Fossils

A 
preserved remain of an organism
ICE
TAR
AMBER
SEDIMENTARY
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2
Q

Mineralization (petrification)

A

When a structure trapped in sediments is replaced by minerals

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3
Q

Relative dating

A

Uses mathematical formulas to study the amount of radioactive isotopes in a fossil

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4
Q

Why do isotopes decay?

A

Atoms with different number of neutrons the wrong number of neutrons, it is not stable

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5
Q

Where are radioactive isotopes found?

A

Natural processes like solar radiation and star formation

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6
Q

Half-life

A

the amount of time it takes half a radioactive isotope to decay into a stable element

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7
Q

C-14 becomes N in … years

A

5730( recent bones)

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8
Q

U-238 becomes Pb in …. years

A

4.5 billion years ( old bones)

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9
Q

Evolution

A

All of the changes that have transformed life over an immense time

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10
Q

Gradualism

A

the theory that the Earth has been slowly shaped by natural forces

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11
Q

Who tried to explain how modern life forms differed from fossils

A

Jean Baptista Lamark

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12
Q

Radiometric dating

A

Uses mathematical formulas to study the amount of radioactive isotopes in a fossil

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13
Q

Who had the theory of gradualism

A

Charles lyell

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14
Q

Examples of gradualism

A

Canyons- made from rivers that have eroded

Volcanoes- form islands, volcanoes change earth

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15
Q

Idea of inheritance of acquired traits

A

By using of not using certain body parts, an organism develops certain characteristics. These enhanced characteristics would be passed on to the offspring. An example is a kangaroo’s powerful hind legs were the result of ancestors strengthening their legs by jumping, the leg strength was then passed to the offspring.

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16
Q

Why is the idea of acquired traits wrong

A

This idea is wrong because an acquired characteristic would have to modify DNA of specific genes for it to be inherited and there is no evidence that this happens

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17
Q

Father of evolution

A

Charles Darwin

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18
Q

What observations did Darwin make about the island animals compared to those in South America and what did Darwin infer about his observations?

A

Darwin noticed the plants and animals in south america had a definite character . The animals found in south america distinct from those found in europe. Some of the fossils found were gigantic versions of the modern animals. Darwin inferred mainland species changed after they colonized the islands and adapted to their new environment.

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19
Q

Using Lyell’s theories how did Darwin explain the fossils he found in the Andes mountains

A

Lyell believed mountain ranges can be thrusted up centimeter by centimeter because of earthquakes occurring over millions of years. When Darwin found fossils ocean organisms in the Andes he reasoned that earthquakes lifted the rock bearing those marine fossils from the sea floor.

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20
Q

Two key conclusions Lyell ( and Darwin) based on geologic evidence

A
  • The slow process of mountain building and erosion suggests the earth is solid.
  • The gradual process occurring over spans of time could cause change on Earth. Darwin would apply the idea of gradual change to the evolution of Earth’s life forms
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21
Q

Back in England Darwin was well known as

A

a famous naturalist

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22
Q

Thomas Malthus

A

Writes an essay on human populations. Essay explains how human suffering was due to the fact that populations grow faster than resources can be produced

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23
Q

Darwin did not immediately publish his ideas; it wasn’t until another naturalist _____ came up with the same ides for evolutionary changes

A

Alfred Wallace

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24
Q

Darwin published the book

A

The origin of Species

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25
The species alive today descended from
ancestral species
26
When organisms spread into new habitants the accumulate modifications or ______ in a process called______
adaptations; descent with modification ( evolution)
27
Describe what adaptations help a jack rabbit survive in it environment
Jack rabbits benefit from fur that blends well in the desert and ears that help keep its body cool. The white fur of a jack rabbit provides camouflage in the snowy regions of the snow shoe hare's range
28
artificial selection
Selective breeding of domestic animals and plants
29
Darwin's second major point is natural selection is defined as
The process by which individuals with inherited characteristics well suited to the environment leave more offspring on average than other individuals. Certain traits can give individuals advantages over others of the same species in the environment.
30
Natural Selection
A process in which some individuals have genetically-based traits that improve survival or reproduction and thus have more offspring surviving to reproduce than other individuals
31
Evolution
Changes in the occurrence of genetic traits in a population due to natural resulting in the transformation of all life over long periods of time
32
Adaptation
A trait that allows an organism to survive in its environment
33
Homologous Structure
Similar structure found more than one species that shares a common ancestor
34
Vestigial structure
Remnant of a structure that may have had a larger function in a species ancestors but has a lesser function today.
35
Natural selection human influenced nature Moths Insects Bacteria
peppered moth: Pollution changed the environment. nature selecting with the better trait. blend in Insects: resistant to pesticides need to change pesticide gene on normal chromosome bacteria: tuberculosis ( resistant to antibiotics) people stop taking medication early doctors over prescribe exposing unnecessary
36
``` Natural selection human examples Sickle cell Lactose intolerance HIV Skin color ```
Sickle cell: carries better chance of surviving from malaria Lactose intolerance: As adult the gene turns off. Group of people stay on have another food source. Advantageous if you have cows, European decent. Most people lactose intolerant HIV: Group of people, Europe< resistant to HIV ancestors survived the plague. CC45 protein used for HIV to get into the cell not there Skin color: in lots of sun( dark skin gets vitamins) light skin places with less sun make vitamin D and folic acid dark skin in Maine dont get vitamins
37
The source of adaptations that nature selects
meiosis
38
Forms DNA variations
mutations | recombination
39
Homeotic genes
Regions of DNA that are responsible for turning on and off other genes. They regulate the timing of gene activities by making regulatory proteins that turn gene on.
40
SrY gene
Determines gender of baby
41
HOX genes
a regulatory gene essential in embryological development and determine where the regions of the body should be
42
Taxonomy
The study of naming all organism and placing the in groups
43
The naming system developed by carols linneaeus
Developed a system with two main characteristics, a two part name for each species, or ordering of species. The system assigns a two part name
44
Scientific name
The two names used global to refer to a life form
45
Classification
The part of taxonomy where life forms are grouped with others with similar ancestry of appearance
46
Phylogenetic tree
diagrams Darwin used as a way of classification
47
analogous
Unrelated species from similar environments have adaptations that are similar. ex. insects and bird wings
48
embryological structures
Comparing the embryos to see if they are the same group to group them in
49
How is molecular data being used to study evolutionary history
Researchers are sequencing the genomes of species. The molecular data are independent of the structural data that is usually used for classification. When molecular data agree with other sources it provides a strong way to test the hypothesis of evolution.
50
Cladistics
A phylogenetic diagram that specifies unique features
51
Georges Lamaitre's theory
Big Bang Theory
52
When did the big bang theory occur
14 billion years ago
53
galaxies moving away appear
red shifted
54
galaxies moving toward earth appear
blue shifted
55
When did stars form
5 billion years ago
56
When did earth form
4.6 billion years ago
57
Conditions of earth
``` air quality: water vapor CO2 ammonia N2 Methane CH4 surface: meteorite molten/hot lots of solar radiation water: first gas ```
58
when did oceans form
3.8 billion years ago
59
Spontaneous Generation ( Abiogenesis)
The idea that life could be created from inanimate objects
60
Redi experiment
maggot origins ( lid, covered, cloth) maggots dont form from meat
61
Pasteur experiment
microorganisms boil broth air cant get in. Bacteria gets caught because of special design
62
Explain miller's experiment and what evidence it provides
experiment: Stimulates conditions of early earth. used gases in a flask to represent earths ancient atmosphere, and electric sparks to represent lightning as an energy source evidence: provide evidence that small organic molecules could have formed from chemical and physical processes on early earth
63
Panspermia ( crick theory)
Some organic monomers could come from space on meteorites
64
Primordial soup
Collection of the monomers and polymers in the ocean (thought where the first cell formed.
65
JPL experiment
monomer, energy (heat), catalyst
66
when did planets start to form
5 billion years ago
67
What did volcanic activity produce
a dense atmosphere on early earth containing gases like methane, ammonia, carbon dioxide
68
What could RNA ribozymes done on early earth
RNA ribozymes could be a template strand to make a copy of itself or make new RNA molecules by reading an RNA template strand. They also connect amino acid monomers into long chains of protein during "translation" replacing molecules evolved into DNA, RNA and proteins phospholipids began forming bilayers around groups of proteins and nucleic acids forming early cell membranes
69
When did the first life form
3.6 billion years ago
70
Five main traits of first cell
prokaryotic cell unicellular consumer anaerobic
71
What happened 2.7 billion years ago and why were they well adapted
success of the cyanobacteria that do photosynthesis. They started changing the planet
72
What are stromatolites and what do they indicate about some of the first life forms
Stromatolites are dome shaped rocks. They are composed of thin layers of sediment passed tightly together. Resembling layers of onions. They indicate that simpler forms of life than the photosynthetic prokaryotes existed 3.5 billion years ago
73
what happened 1.8-2.1 billion year ago
first eukaryote cell
74
endosymbiosis theory
Eukaryotes may have evolved from small prokaryotes that lived within a large host cell. DNA in mitochondria/ chloroplast develop membrane in mito/chloro as if engulfed.

Biology (5 decks)

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