A. they arose out of Africa less than 200,00 years ago
Explanation: All of it is in gamete formation. Meaning, it is going through a gamete formation which also means that pairs of alleles that are for different traits, segregate. They move on independently from one another, never touching.
For your question, It's incomplete dominance which is when cases with one allele isn't complete to be dominant over another allele. It's all got to come together in order for it to become a strong and dominant allele, or else it won't be complete and won't become and do what it has to.
I hope this help you and I hope that I gave you what you wanted/needed for this question.
to a scientist and asked him for his secret formula but he said I had to do the ravioli dance first before I got to see it and I made a fool of myself and died that morning
B) The Earth's crust is pulled apart creating deep folds and then pushed together generating steep scarps to create fault-block mountains
