blog #3 Explain microevolution

this is an evolution from small specific genetic changes that results  into a new subspecies. there are two main sources of genetic variation. mutation and gene shuffling, mutations occur from changes, mistakes or replication of dna. gene shuffling is basically when u mix up the dna of the parents.

blog #4 natural selection

directional selection is - this is when individuals with a trait have a higher fitness than the others without-birds with bigger, thicker beaks can feed more easily on larger, harder thicker-shelled seeds. if theres a food shortage that leaves only large thick seeds. the birds with bigger beaks have a higher access food which means the adapted birds have a higher fitness, and the average beak size shall increase.

stabilizing selection is - this is when average individuals have a higher chance of living - when babies are born small ones have a chance of getting sick which lowers there fitness but bigger ones have difficulty being born so the average baby has the highest fitness.

Disruptive selection is - when  individuals in the the middle of species have the lower chance of living - like when seeds of medium size are less common the bird has the least chance of survival compared to birds that eat big and small seeds.

Describe the three types of selection: directional, stabilizing and disruptive and give an example of each in your own words

directional selection is - this is when individuals with a trait have a higher fitness than the others without-birds with bigger, thicker beaks can feed more easily on larger, harder thicker-shelled seeds. if theres a food shortage that leaves only large thick seeds. the birds with bigger beaks have a higher access food which means the adapted birds have a higher fitness, and the average beak size shall increase.

stabilizing selection is - this is when average individuals have a higher chance of living - when babies are born small ones have a chance of getting sick which lowers there fitness but bigger ones have difficulty being born so the average baby has the highest fitness.

Disruptive selection is - when  individuals in the the middle of species have the lower chance of living - like when seeds of medium size are less common the bird has the least chance of survival compared to birds that eat big and small seeds.

Why is evolution a theory and not a law?

A scientific fact is something that can be tested and proven time and time again. but evolution takes place over generations and generations so it can not really be tested. so in such a way it is called theory and not fact.