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3.10.2021 21:21

Kartlar: Human Bology chapter 23 | Quzlet

Fen bil mleri / Biyoloji / evrim biyolojisi

Human Biology chapter 23 Bu setteki terimler (30) 12 and 20 billion years

The estimate of how old the physical Universe in

ago

which we live

second generation star

our sun is most likely a

4 and 3.5 billion years

"Life" probably arose between

ago

DNA

can store information but can't do anything

makes a very good chemical machine but is Protein

unable to contain information needed to reproduce itself

can store "reproductive" information and can also RNA

catalyze simple chemical reactions including peptide production

Cambrian explosion

evolution

when nature "experimented" with a wide variety of multicellular body forms

the process of continuous and progressive change

descent with

a population favoring the reproductive success of

modification

those forms "better suited" to the environment

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1st law of DNA

Kartlar: Human Bology chapter 23 | Quzlet

no process can be 100% efficient

replication

2nd law of DNA

natural processes tend toward randomness or

replication

disorder

resorting and crossing over of chromosomes will independent assortment

tend to put mutations into new genetic environments. This may influence whether and how they are expressed i.e. produce new selectable traits

Changed Environment

gene change can never quite catch up with environmental change

often there is more than one allele for any given balanced polymorphism

gene that appears to be equally "good" under the local circumstances. Each of these possibilities will tend to be expressed in a fairly stable percentage of the population.

a random environmental disaster can reduce a Population Bottlenecks

population to near extinction. this ordinarily results in a reduction in the genetic diversity of the population or species

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