Why do some mutations not affect the phenotype
The mutation can occur in a stretch of DNA with no function. It is only a problem if it results in a different amino acid joining the protein.
Sometimes mutations have no effect because each amino acid has a few different sequences of bases: the correct amino acid might still join the chain.
Define the term 'sex-linkage'
A term referring to the phenotypic expressions of alleles on sex chromosomes.
Newton's First Law
Every object continues in its state of rest or movement unless a force acts upon it.
Newton's Second Law
The acceleration if an object is proportionate to the net force acting on the object. The greater the mass the greater the force for the acceleration.
Acceleration= net force/mass
Newton's Third Law
Whenever one object exerts a force on a second object, the second object exerts an equal and opposite reaction on the first.