NEET BIOLOGY

Detailed explanation-1: -These shared genes preserve a record of an ancestor that they share with each other, but not with bacteria. Because genes change over time, the more similar the DNA of two organisms, the more recently they share a common ancestor. Observations from anatomy, fossils, and embryological development are all rooted in DNA.

Detailed explanation-2: -Gene. A segment of a DNA molecule (a sequence of bases) that codes for a particular protein and determines the traits (phenotype) of the individual. A gene is the basic unit of heredity in a living organism.

Detailed explanation-3: -Fossils, anatomy, embryos, and DNA sequences provide corroborative lines of evidence about common ancestry, with more closely related organisms having more characteristics in common. DNA underlies the similarities and differences in fossils, anatomy, and embryos.

Detailed explanation-4: -Evidence for evolution: anatomy, molecular biology, biogeography, fossils, & direct observation.