Biology 3593B Lecture Notes - Lecture 4: Phenotypic Trait, Heritability, Melanocortin 1 Receptor
Document Summary
Phenotype: the characters of an organism, whether due to a genotype or environment. Genotype: the set of genes possessed by an individual. Introduction: we always think about genotype; we need to know that the environment plays a role through various interactions! The result of these interactions can be changes in colour, size and morphology among its own or different species: variation in human populations is modest when compared to other animal species; data were calculated on length and height. Case study kermode bear in british columbia: Panthera tigris (tiger): a recessive allele is responsible for the white colour in white tigers; the recessive allele that causes the white colour can also cause abnormal vision. This is an example of pleiotropy ; where one gene affects more than one phenotypic trait. White tigers are often maintained in zoos because of public interest. Morphology: morphological variation can be seen everywhere from stature, weight, build, distinctive features such as beaks, fins, wings etc.
