natural selection Flashcards
what is an allele?
a variable form of a gene
define genetic diversity?
the total number of different alleles in a population
how does genetic diversity lead to variation?
different combinations of alleles mean different proteins are produced, resulting in different characteristics.
organisms with what traits are more likley to survive,reproduce and pass on their alleles ?
organisms with advantageous traits
the more sucsessful and organism is at reproducing…
the more likely its alleles will be passed on to the next generation, increasing the allele frequency.
what is the first step of natural selection?
their is variation in characteristics within a species
what is the second step of natural selection?
more genetic variation emerges within a population due to random mutations
what is the third step of natural selection?
individuals with alleles that code for traits that are advantageous for survival are more likely to reproduce
what is the fourth step of natural selection
these advantageous alleles are passed down to offspring
what is the fifth of natural selection?
over time, these beneficial alleles become more common in the population.
what does natural selection lead to?
leads to populations becoming more adapted to their enviroment over generations
what is the first step of antibiotic resistances?
Some bacteria develop random mutations that provide resistance to antibiotics.
what is the second step of antibiotic resistance?
When antibiotics are used, only the resistant bacteria survive, while the others die off.
what is the third step of antibiotic resistance?
the resistant bacteria reproduce, passing on there resistant alleles to their offspring.
what is the fourth step of antibiotic resistance?
Over time, the proportion of resistant alleles increases, leading to mostly resistant bacteria.
