The exchange of genetic material between homologous DNA molecules during meiosis or DNA repair.

A group of compounds with a similar structure and chemical properties, differing by a repeating unit like –CH₂–.

Traits shared by species due to common ancestry, even if they serve different functions.

Chromosomes that are similar in structure and gene content, paired during meiosis.

The similarity in characteristics resulting from shared ancestry.

Similarity in traits not due to common ancestry, but to convergent evolution or evolutionary reversals.

The arrangement of similar fossil assemblages in the same order in different geographical locations.

An organism that maintains a constant body temperature, synonymous with homeotherm.

Describes an ovule that is straight with the micropyle, nucellus, and funiculus aligned in a straight line.

The resemblance of corresponding parts of organisms that are of the same type or form.