After reading the Learn. Genetics Observable Human Characteristics article, it should be clear that many observable human features are controlled by multiple genes, as well as being influenced by environmental factors. However, from the list given in the reading, which of the following trait(s) appear to be controlled by a single gene and entirely genetically based/inherited? (i. e., without environmental factors). Select a l that apply.

a. Freckles
b. Hand clasping
c. Red/green colorblindess
d. PTC tasting
e. curly hair
f. tongue rolling

Freckles - Spots are constrained by both natural elements and qualities. in the event that one or the two guardians have spots , there is a high likelihood that the youngster will have spots as well. nearness of spots is constrained by mc1r quality. be that as it may be the size, shading and example will rely upon the natural elements.   Hand Clasping -  There has been no proof of hand fastening being acquired. it is absolutely ecological.   Red / Green Visual weakness - It is totally hereditary. it is inherited from guardians. it is brought about by x connected latent gene.the ladies are minor transporters and the infection is more regularly found in guys than females.   PTC Tasting - It is totally hereditary. it relies upon the hereditary make up of the individual whether an individual will have the option to taste phenylthiourea or not. it is severe in taste anyway just individuals with hereditary make up required for PTC tasting can taste it. it is boring to other people.no natural elements impact this .   Curly Hair - It is frequently impacted by nature. be that as it may, it legacy has been eccentric. there is no proof of a solitary quality being answerable for wavy hair.   Tongue moving - It is both hereditary and environmental.however, a solitary quality isn't answerable for this.