A gene can be considered a. a unit of hereditary information b. a piece of DNA that contains information c. B.C. c. 10,000 years ago d. 9,000 years ago e. 13,000 years ago 31. Natural selection is differential survival and reproduction of different phenotypes in a population. Evolution is defined as changes in genotypic frequencies in a population due to selection.
Natural selection is differences in survival among individuals.
Evolution is caused only by natural selection. There are two plant species in the same habitat. One has 10, the other 14 chromosomes in their somatic cells. Five populations have the birth and death rates given below. DNA contains many different genes that are transcribed into a. tRNA, m RNA, and protein b. tRNA, protein, and rRNA c. protein, m RNA, and rRNA d.