If an individual were heterogeneous then there would be a 50/50 chance of being either dominant or recessive. I hope this helps. :)
Answer;
-Francis Galton
Explanation;
-This phrase was popularized by Francis Galton in discussion of the influences on social development. The two to first bring the argument to light may have been Locke and Rene Descartes, when Locke proposed that people are born without any innate ideas.
-The nature vs. nurture hypothesis is a scientific, cultural, and philosophical debate about whether human culture, behavior, and personality are caused primarily by nature or nurture.
A. The onset of the menstrual flow
The answer would be -- A. Cenozoic
