QUESTION 10 After reading the Learn.Genetics Observable Human Characteristics ar

Question

QUESTION 10 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. Freckles O Hand clasping O Red/green colorblindess O PTC tasting O curly hair O tongue rolling

Explanation / Answer

Yes, many observable human features are controlled by multiple genes as well as being influenced by the environment factors.

Lets talk about the given list:

#FRECKLES-FRECKLES ARE CONTROLLED BY BOTH ENVIRONMENTAL FACTORS AND GENES. IF ONE OR BOTH PARENTS HAVE FRECKLES , THERE IS A HIGH PROBABILITY THAT THE CHILD WILL HAVE FRECKLES TOO. PRESENCE OF FRECKLES IS CONTROLLED BY MC1R GENE. HOWEVER, THE SIZE,THE COLOR AND PATTERN WILL DEPEND ON THE ENVIRONMENTAL FACTORS.

#HAND CLASPING- THERE HAS BEEN NO EVIDENCE OF HAND CLASPING BEING INHERITED. IT IS PURELY ENVIRONMENTAL.

#RED/GREEN COLORBLINDNESS- RED/GREEN COLORBLINDNESS IS COMPLETELY GENETIC. IT IS INERITED FROM PARENTS. IT IS CAUSED BY X LINKED RECESSIVE GENE.THE WOMEN ARE MERE CARRIERS AND THE DISEASE IS MORE OFTEN SEEN IN MALES THAN FEMALES.

#PTC TASTING- IT IS COMPLETELY GENETIC. IT DEPENDS ON THE GENETIC MAKE UP OF THE PERSON WHETHER A PERSON WILL BE ABLE TO TASTE PHENYLTHIOUREA OR NOT. IT IS BITTER IN TASTE HOWEVER ONLY PEOPLE WITH GENETIC MAKE UP REQUIRED FOR PTC TASTING CAN TASTE IT. IT IS TASTELESS TO OTHER PEOPLE.NO ENVIRONMENTAL FACTORS INFLUENCE THIS .

#CURLY HAIR- CURLY HAIR IS OFTEN INFLUENCED BY THE ENVIRONMENT. BUT IT INHERITANCE HAS BEEN UNPREDICTABLE. THERE IS NO EVIDENCE OF A SINGLE GENE BEING RESPONSIBLE FOR CURLY HAIR.

#TONGUE ROLLING- TONGUE ROLLING IS BOTH GENETIC AND ENVIRONMENTAL.HOWEVER, A SINGLE GENE IS NOT RESPONSIBLE FOR THIS.

SO IN THE CONCLUSION, THE TRAITS WHICH ARE CONTROLLED BY A SINGLE GENE AND ARE ENTIRELY GENETIC ARE RED/GREEN COLORBLINDNESS,PTC TASTING,FRECKLES.

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