<em>Pleiotropy is a genetic term used to describe a phenomenon in which multiple traits or phenotypic expressions are dictated by a single gene. </em>
<em>Pleiotropy </em>was first discovered by Mendel during his experiment with pea plant when he noticed that flower colour is always related to the leaf axil as well as seed coat colour.
There are different types of pleiotropy including:
Gene pleiotropy
Developmental pleiotropy
Antagonistic pleiotropy
Selectional pleiotropy
In the case of marfan syndrome, inheritance of a single allele results in tall and long limb, cardiovascular and eye defects. This thus means that that single allele which represents a gene is responsible for expression of those traits. A clear cut case of pleiotropy.
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