Bio 122 exam 3 UPDATED ACTUAL Questions And Correct Answers
Terms in this set (136)
What did Darwin propse he proposed the MECHANISM for evolution- which was natural selection
Was Darwin the first to think about evolution he wasn't the first one to think of evolution he was the first to propose the
mechanism
evolution was already around
, Natural selection survival of the fittest
Certain individuals survive and produce more offspring because they have
advantageous inherited traits
"The struggle for existence"
Struggle for existence If helpful traits appear in an organism, those individuals are more likely to survive
and reproduce. Because traits are passed down, their offspring will likely have
those same traits. Darwin called this process natural selection, or “survival of the
fittest.”
Conditions for evolution by natural selection to occur 1. Phenotypic variation
2. Heritability
3. Variation in fitness/Differential reproduction
4. Variation in fitness is due to phenotypic variation
1. Phenotypic variation Individuals in a population look or act differently. Variation among population
Example: shape of the cell is sickled (different)
2. Heritability Those differences can be passed down genetically from parents to offspring.
Example: Did your parents have it?
3. Variation in fitness Do some individuals reproduce more than others
Example: Some humans have 0 kids, some humans have 6 kids
4. variation in fitness is due to phenotypic variation The individuals that reproduce more do so because of their inherited traits.
Example: brown beetles survive better in dirt, so they reproduce more than green
ones.
Conditions for evolution by natural selection to occur Evolution by natural selection occurs when:
even more concisely
1. Heritable variation
Leads to
2. Differential reproductive success.
Evolution definition change in allele frequencies of a population over time
did parents pass down different things
fitness number of offspring produced
Terms in this set (136)
What did Darwin propse he proposed the MECHANISM for evolution- which was natural selection
Was Darwin the first to think about evolution he wasn't the first one to think of evolution he was the first to propose the
mechanism
evolution was already around
, Natural selection survival of the fittest
Certain individuals survive and produce more offspring because they have
advantageous inherited traits
"The struggle for existence"
Struggle for existence If helpful traits appear in an organism, those individuals are more likely to survive
and reproduce. Because traits are passed down, their offspring will likely have
those same traits. Darwin called this process natural selection, or “survival of the
fittest.”
Conditions for evolution by natural selection to occur 1. Phenotypic variation
2. Heritability
3. Variation in fitness/Differential reproduction
4. Variation in fitness is due to phenotypic variation
1. Phenotypic variation Individuals in a population look or act differently. Variation among population
Example: shape of the cell is sickled (different)
2. Heritability Those differences can be passed down genetically from parents to offspring.
Example: Did your parents have it?
3. Variation in fitness Do some individuals reproduce more than others
Example: Some humans have 0 kids, some humans have 6 kids
4. variation in fitness is due to phenotypic variation The individuals that reproduce more do so because of their inherited traits.
Example: brown beetles survive better in dirt, so they reproduce more than green
ones.
Conditions for evolution by natural selection to occur Evolution by natural selection occurs when:
even more concisely
1. Heritable variation
Leads to
2. Differential reproductive success.
Evolution definition change in allele frequencies of a population over time
did parents pass down different things
fitness number of offspring produced
