NEET BIOLOGY

Detailed explanation-1: -Like structural homologies, similarities between biological molecules can reflect shared evolutionary ancestry. At the most basic level, all living organisms share: The same genetic material (DNA) The same, or highly similar, genetic codes.

Detailed explanation-2: -Although each organism’s DNA is unique, all DNA is composed of the same nitrogen-based molecules. So how does DNA differ from organism to organism? It is simply the order in which these smaller molecules are arranged that differs among individuals.

Detailed explanation-3: -The DNA of two closely related organisms will be more similar than the DNA of two distantly related organisms. Based on the current research findings, all organisms on earth are evolved from a common ancestor, which is assumed to be a single-celled organism and present at 3.5 billion years ago (BYA).

Detailed explanation-4: -Even about 15% of human genes can be found in fruit flies! These shared genes are evidence of evolution from a common ancestor and the relatedness of all life on Earth. The shared genes are called homologous genes, or genes which share a common ancestry either between or within species.

Detailed explanation-5: -Answer and Explanation: The DNA of related organisms shows similarity between the species because some genes will have the same or similar sequences. Evolutionarily related organisms from different species have a common ancestor.