All the human races like Africans, Asians, Europeans, Americans and others might have evolved from a common ancestor. Provide a few evidences in support of this view.

All the human races like Africans, Asians, Europeans, Americans and others might have evolved from a common ancestor. Provide a few evidences in support of this view.

No two individuals are absolutely alike in a population. Why?

"Energy flow in a food chain is unidirectional." Justify this statement. Explain how the pesticides enter a food chain and subsequently get into our body.

What are homologous organs? Can the wings of a butterfly and the wings of a bat be regarded as homologous? Why?

After attending a class lecture on evolution, Katy came home and gathered photographs of all her possible relatives and grandparents. Afterward she made a family tree using those photographs in which she was surprised to see her resemblance to most of her relatives and grandparents.

(i) Why was there resemblance seen by Katy to most of her relatives?

(ii) What are the laws of inheritance? Name them.

(iii) What values are shown by Katy?

During a science lecture on evolution and inheritance, Amit got confused and went to clear his doubts. He asked, if characters can be passed to the future generation, then why does not he have the tattoo that his mother has on her arm. The teacher smiled and told him about inherited and acquired characters.

(i) What are inherited and acquired characters?

(ii) The tattoo on the arm of Amit’s mother was not present on Amit’s arm. Give a scientific reason.

(iii) What values are shown by Amit?

To where can the earliest members of the human species be traced to?

Which tools can be used for tracing the evolutionary relationships of human evolution?

If your mother has pierced ears, will you inherit the trait? If not, why?

Write the scientific name imparted to the human species.