This concept about genetics is wrong because major phenotypic traits are in general quantitative.
A quantitative trait is a phenotypic feature governed by the interaction between genes and the environment.
Quantitative traits involve the expression of many genes to shape a given phenotypic characteristic (e.g., head).
In conclusion, this concept about genetics is wrong because major phenotypic traits are in general quantitative.
Learn more about quantitative traits here:
https://brainly.com/question/88535
#SPJ1