Distribution of phenotypes within a population may be impacted by different types of natural selection. These types of selection include;
Directional selection involves a change in the environment shifts of phenotypes observed. Example is the giraffe neck-length, where the length got longer and longer over time to reach the leaves at the top of trees.
Stabilizing selection , this is a selection where an average phenotype is favored. example is number of eggs laid by birds such that too many eggs will be a waste of energy because some chicks would starve.
Disruptive selection is a selection where individuals with an average value of a trait are affected most while those with values below average are affected least. Example small individuals are capable of hiding from predators while big individuals can not fit in the hiding place but instead will fight with predators.
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This means that the mothers green eyes are recessive alleles and the fathers brown eyes are dominant alleles. The blue eyed puppy is blue eyed because there must have been a gene in the mothers or fathers past generation.
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Fibrous Joints. Fibrous joints are held together by strong connective tissue with only a slight capacity to stretch.
Cartilaginous Joints. Cartilaginous joints allow for slight movement and occur where bone ends are covered
Synovial Joints. Synovial joints allow the greatest degree of movement due to their structure.
Types of Synovial Joints. The many synovial joints of the human body enable movement of various types
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