process of natural selection foldable natural selection = ns gle 0807.5.3 - gle 0807.5.4 - spi...
DESCRIPTION
Overproduction egg sac GLE GLE SPI SPITRANSCRIPT
Process of Natural
Selection Foldable
Natural Selection = NS
GLE 0807.5.3 - GLE 0807.5.4 - SPI 0807.5.2 - SPI 0807.5.3GLE 0807.5.3 - GLE 0807.5.4 - SPI 0807.5.2 - SPI 0807.5.3
NS – individuals better adapted to their environment survive and reproduce more successfully than less well-adapted organisms do.
GLE 0807.5.3 - GLE 0807.5.4 - SPI 0807.5.2 - SPI 0807.5.3GLE 0807.5.3 - GLE 0807.5.4 - SPI 0807.5.2 - SPI 0807.5.3
Overproduction
egg sac
GLE 0807.5.3 - GLE 0807.5.4 - SPI 0807.5.2 - SPI 0807.5.3GLE 0807.5.3 - GLE 0807.5.4 - SPI 0807.5.2 - SPI 0807.5.3
• Overproduction: organisms in a population produce more offspring than their environment can support.
Many die through predation or starvation
GLE 0807.5.3 - GLE 0807.5.4 - SPI 0807.5.2 - SPI 0807.5.3GLE 0807.5.3 - GLE 0807.5.4 - SPI 0807.5.2 - SPI 0807.5.3
Example:• Tarantula’s egg sac holds 500 to 1,000 eggs. • Some eggs survive and develop into adult spiders and some die.
GLE 0807.5.3 - GLE 0807.5.4 - SPI 0807.5.2 - SPI 0807.5.3GLE 0807.5.3 - GLE 0807.5.4 - SPI 0807.5.2 - SPI 0807.5.3
Photography of Egg sack - Poecilotheria pederseni
The moulting process
Genetic Variation Within A Population
GLE 0807.5.3 - GLE 0807.5.4 - SPI 0807.5.2 - SPI 0807.5.3GLE 0807.5.3 - GLE 0807.5.4 - SPI 0807.5.2 - SPI 0807.5.3
• Variation: Differences in a population of organisms of the same species.Variations/Genetic Adaptations - passed to offspring from parents through genes/alleles.
GLE 0807.5.3 - GLE 0807.5.4 - SPI 0807.5.2 - SPI 0807.5.3GLE 0807.5.3 - GLE 0807.5.4 - SPI 0807.5.2 - SPI 0807.5.3
Example:• Every individual has its own combination of traits. • Each tarantula is similar, but not identical, to its parents.
GLE 0807.5.3 - GLE 0807.5.4 - SPI 0807.5.2 - SPI 0807.5.3GLE 0807.5.3 - GLE 0807.5.4 - SPI 0807.5.2 - SPI 0807.5.3
Struggle to Survive
(adaptation)
Newly inherited traits help organisms survive and reproduce in their environment.
Some variations are favorable and help organisms compete to survive and reproduce.
GLE 0807.5.3 - GLE 0807.5.4 - SPI 0807.5.2 - SPI 0807.5.3GLE 0807.5.3 - GLE 0807.5.4 - SPI 0807.5.2 - SPI 0807.5.3
Example:• Some tarantulas have traits that make it more likely they will survive. •better able to fight off predators
GLE 0807.5.3 - GLE 0807.5.4 - SPI 0807.5.2 - SPI 0807.5.3GLE 0807.5.3 - GLE 0807.5.4 - SPI 0807.5.2 - SPI 0807.5.3
Adult female Brachypelma smithi, showing a bald patch after kicking hairs off of her abdomen.
Successful Reproduction
(natural selection)
Over time, offspring with helpful variations
increase and become a larger percentage of the population.The organisms with favorable variations become plentiful. The ones without favorable variations become rare or extinct.GLE 0807.5.3 - GLE 0807.5.4 - SPI 0807.5.2 - SPI 0807.5.3GLE 0807.5.3 - GLE 0807.5.4 - SPI 0807.5.2 - SPI 0807.5.3
Example:• Tarantulas best adapted to their environment are likely to survive and reproduce. • Offspring may inherit traits that help them survive.
GLE 0807.5.3 - GLE 0807.5.4 - SPI 0807.5.2 - SPI 0807.5.3GLE 0807.5.3 - GLE 0807.5.4 - SPI 0807.5.2 - SPI 0807.5.3
