Biology Questions and Answers
fixism, both admit the existence of
processes that causecharacteristics of the living bd changes in theeings in the (^)
past.
They have however differentexplanations for those changes. (^)
Lamarckismand disuse with combines tthe law he law oof the f use
transmission of acquired characteristics
to explain defends the action ofthe changes. Darwi the naturalnism
selection.
- In the time of Darwin the
results of Mendel’s research
on biological inheritance had
not been published, Genetics
was not yet developed,
neither DNA nor the concept
of genetic mutation were
known. What is the modern
darwinist theory that
incorporates these bodies of
knowledge?
The modern darwinist theory thatincorporates knowledge from Genetics (^)
and Molecular Biology is called
neodarwinism, or evolution. synthetic theory of
- How does the synthetic
theory of evolution
incorporate knowledge from
Genetics and Molecular
Biology into the darwinism?
Today it is known that variation of
inherited characteristics is created by
alterations in the genetic material of theindividuals, momodifications or recombire precisely bnationsy (^) of DNA
molecules. Small changes in the genetic
material accumulate phenotypical characteristicsand new emerge. (^)
The carriers of these characteristics
then are submitted to From modern Biology itsnatural sel recognized thatection. (^)
natural selection generates in a given
population an of alleles and genes more favorable toincrease in the frequency
survival and reproduction; less
advantagebe eliminateous genes and alleles tend tod.
- Using the concepts of
variability, environmental
pressure and natural selection
how does the synthetic theory
explain the darwinian natural
selection?
Genetic variability occurs from
recombinatiosexual reproduction an of chromosomnd from DNAes during
mutations in germ cells and gametes.
Such variabilityare carriers of some new phenotypical creates individuals who
characteristics compared to their
ancestors.submitted to These individuals arenvironmental pressuree (^)
and can concerninbe more or less well-succeg survival or reproduction.eded
Those better succeeded transmit their
genetic patrimony descendants increasinto a larger number ofg the frequency of (^)
their genes in the population; those less
well-succeedgenes to a small number of descendantsed tend to transmit their (^)
decreasing the frequency of their genes
in the population extinct. This process is called or even becomingnatural (^)
selection (preservation of organisms
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