Question

All the human races like Africans, Europeans, Americans and others might have evolved from a common ancestor. Which of the following are the evidences in support of this view?
A. Common body plan of all in structure, physiology and metabolism
B. Constant chromosome number of all and common genetic blueprint
C. Free interbreeding
D. All of the above

Answer 1

Hint:- Mammals have evolved from primitive reptiles in the Triassic period about 210 million years ago. Order primate that includes man, great apes, monkeys, Loris, lemurs and tarsiers originated about 65 million years ago during the cretaceous period.

Complete step-by-step solution:- Human evolution has been studied using several tools like excavating, time-dating, and studying fossils for tracing evolutionary relationships. Studying DNA sequences has also played a very important role in this. The diversity of forms and features of human races across the planet is very huge.
People have even been classified according to their races which was determined through their skin colors like yellow, brown, white or black. But there is no biological basis to this differentiation of humans based on their races as all humans are a single species and have evolved from the same ancestor.
We all have originated from Africa as the earliest members of the human species called Homo sapiens can be traced there so our genetic roots can be traced to Africa. Slowly and gradually the members of our species migrated to different geographical areas and separated from some groups and mixed with other groups. According to the geographic conditions they have evolved some differences in their physical appearances.
All the individuals of Homo sapiens sapiens are having the same body plan, metabolism and basic physiology. The chromosome number is constant for them i.e.46 and they breed freely among themselves to produce offspring.
So all of the statements given in the question are correct.
Correct option: D. All of the above

Note:- Homo sapiens sapiens is today’s man and it has evolved from Cro-magnon men about ten thousand years ago in the region around Caspean Sea in Central Asia. Thereafter they migrated in three direction i.e. westwards, eastwards and southwards.