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Natural Selection
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Dawins theory of evolution. → individuals in a species show VARIATION difference in genes caused by alleles. → characteristies most suited to enviroment more likely to survive. factors of natural selection. → AVALIABILITY of food. PREDATORS - biotic > DISEASES - biotic → physical + chemical abiotic Structural / Anatomical. physical differences in biological structure eg. flagella on bacteria webbed feet thick blubber eg. growing in shade/hot CAMEL -hump → Stores fat for energy. - Large feet/toes → standing. stable in sand - close nostrils during sandstorms - rough tounge to eat cahi biotic Antibiotic resistance Physiological something your body does without. being told to - Inside an organism - maintains homeostasis eg. hibernation antibiotic production milk production Convergent Evolution evolving for habitat and lifestyle. eg. placental mole. vs marsupial more. Benefits: aid surival of organisms in their ecological niches said normal growth aid regulation of body temp, metabolism ect. aid in resource conservation and maximisation. water/ nutrients Sunlight/ions LESS variation variation in resistance. ↓ → they have different adaptations as they live in different environments, though originated from same animal. due to mutation Low resistant bacteria billed high resistant survived due to advantageous alleres reproduction between high resistant bacteria selection pressure REPRODUCE good J Behavioural differences in patterns of activity/behaviour genes to offspring eg migration INNATE falls into natural selechon 7 a trait you are BORN with mating rituals Heritable Intrisic - present in animals without learning it from any one Sterotypic - same trait every time Inflexible - never changes or gues consumate - fully developed from first performance eg. spider spinning web, reflex LEARNED: based on experience + observation non-inthsIC. advantageous alleles passed down & natural selection permutable-sequence may change adaptable progressive -performed and vefined meiosis mutations biotic Taboronic Variation Competition Advantageous Surival Breeding Causes...
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Alternative transcript:
of mutations → chemicals → Radiation → Viruse Other vanation → meiosis (prophase 1) independant assortment crossing over -within. Species this causes intraspecific competion. ↓ better alleles survive selection pressures. SOIL salinity Lack of FOOD - predators reproduce for organisms with good alleles seperation by physical Allopatric Speciation →geographic isolation of population causes REDUCED gene flow barner ey! sea, mountains. Coccupying A vapid genetic change alters. - morphology behaviour - habitat preferences. forest) Land B aven time islands will have. 3 different gene poots Sympatic Speciation → no geographical isolation, but still reduced gene flow PRE-MATING often due to prezygotic factors - ecological-diff habitats temporal - reproduce at diff times / seasons. behavioural - courtship behavour in compatable physical/pyschological differences. H reproductive isolation Postzygotic -hybrid fitness -unfertile - hybrid sterility - fit but unable to reproduce they may be in the same place but have different courtship times, so will not breed. Ployploidy- → cell division ERROR in ALL chromosomes. 4n cannot reproduce with 2n!
Natural Selection
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Ahmed Nour ✓™
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Chapter 3 Biodiversity - natural selection, adaptations, evolution.
Ahmed Nour ✓™
402 Followers
Chapter 3 Biodiversity - natural selection, adaptations, evolution.
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Dawins theory of evolution. → individuals in a species show VARIATION difference in genes caused by alleles. → characteristies most suited to enviroment more likely to survive. factors of natural selection. → AVALIABILITY of food. PREDATORS - biotic > DISEASES - biotic → physical + chemical abiotic Structural / Anatomical. physical differences in biological structure eg. flagella on bacteria webbed feet thick blubber eg. growing in shade/hot CAMEL -hump → Stores fat for energy. - Large feet/toes → standing. stable in sand - close nostrils during sandstorms - rough tounge to eat cahi biotic Antibiotic resistance Physiological something your body does without. being told to - Inside an organism - maintains homeostasis eg. hibernation antibiotic production milk production Convergent Evolution evolving for habitat and lifestyle. eg. placental mole. vs marsupial more. Benefits: aid surival of organisms in their ecological niches said normal growth aid regulation of body temp, metabolism ect. aid in resource conservation and maximisation. water/ nutrients Sunlight/ions LESS variation variation in resistance. ↓ → they have different adaptations as they live in different environments, though originated from same animal. due to mutation Low resistant bacteria billed high resistant survived due to advantageous alleres reproduction between high resistant bacteria selection pressure REPRODUCE good J Behavioural differences in patterns of activity/behaviour genes to offspring eg migration INNATE falls into natural selechon 7 a trait you are BORN with mating rituals Heritable Intrisic - present in animals without learning it from any one Sterotypic - same trait every time Inflexible - never changes or gues consumate - fully developed from first performance eg. spider spinning web, reflex LEARNED: based on experience + observation non-inthsIC. advantageous alleles passed down & natural selection permutable-sequence may change adaptable progressive -performed and vefined meiosis mutations biotic Taboronic Variation Competition Advantageous Surival Breeding Causes...
Dawins theory of evolution. → individuals in a species show VARIATION difference in genes caused by alleles. → characteristies most suited to enviroment more likely to survive. factors of natural selection. → AVALIABILITY of food. PREDATORS - biotic > DISEASES - biotic → physical + chemical abiotic Structural / Anatomical. physical differences in biological structure eg. flagella on bacteria webbed feet thick blubber eg. growing in shade/hot CAMEL -hump → Stores fat for energy. - Large feet/toes → standing. stable in sand - close nostrils during sandstorms - rough tounge to eat cahi biotic Antibiotic resistance Physiological something your body does without. being told to - Inside an organism - maintains homeostasis eg. hibernation antibiotic production milk production Convergent Evolution evolving for habitat and lifestyle. eg. placental mole. vs marsupial more. Benefits: aid surival of organisms in their ecological niches said normal growth aid regulation of body temp, metabolism ect. aid in resource conservation and maximisation. water/ nutrients Sunlight/ions LESS variation variation in resistance. ↓ → they have different adaptations as they live in different environments, though originated from same animal. due to mutation Low resistant bacteria billed high resistant survived due to advantageous alleres reproduction between high resistant bacteria selection pressure REPRODUCE good J Behavioural differences in patterns of activity/behaviour genes to offspring eg migration INNATE falls into natural selechon 7 a trait you are BORN with mating rituals Heritable Intrisic - present in animals without learning it from any one Sterotypic - same trait every time Inflexible - never changes or gues consumate - fully developed from first performance eg. spider spinning web, reflex LEARNED: based on experience + observation non-inthsIC. advantageous alleles passed down & natural selection permutable-sequence may change adaptable progressive -performed and vefined meiosis mutations biotic Taboronic Variation Competition Advantageous Surival Breeding Causes...
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Knowunity was a featured story by Apple and has consistently topped the app store charts within the education category in Germany, Italy, Poland, Switzerland and United Kingdom. Join Knowunity today and help millions of students around the world.
Still not sure? Look at what your fellow peers are saying...
iOS User
I love this app so much [...] I recommend Knowunity to everyone!!! I went from a C to an A with it :D
Stefan S, iOS User
The application is very simple and well designed. So far I have found what I was looking for :D
SuSSan, iOS User
Love this App ❤️, I use it basically all the time whenever I'm studying
Alternative transcript:
of mutations → chemicals → Radiation → Viruse Other vanation → meiosis (prophase 1) independant assortment crossing over -within. Species this causes intraspecific competion. ↓ better alleles survive selection pressures. SOIL salinity Lack of FOOD - predators reproduce for organisms with good alleles seperation by physical Allopatric Speciation →geographic isolation of population causes REDUCED gene flow barner ey! sea, mountains. Coccupying A vapid genetic change alters. - morphology behaviour - habitat preferences. forest) Land B aven time islands will have. 3 different gene poots Sympatic Speciation → no geographical isolation, but still reduced gene flow PRE-MATING often due to prezygotic factors - ecological-diff habitats temporal - reproduce at diff times / seasons. behavioural - courtship behavour in compatable physical/pyschological differences. H reproductive isolation Postzygotic -hybrid fitness -unfertile - hybrid sterility - fit but unable to reproduce they may be in the same place but have different courtship times, so will not breed. Ployploidy- → cell division ERROR in ALL chromosomes. 4n cannot reproduce with 2n!