When dna is copied, sometimes a new, incorrect base-pairing appears within the structure of a new dna molecule replacing original base pairs. this mistake is called a base-pair

How energy move through ecosystem ?

Organisms may contain up to five levels of organization within their bodies. which level of organization is shown by the liver? a. tissue b. organ c. organism d. organ system

1. mendel observed that pea plants had traits, such as color, that were either “one or the other,” never something in between. discuss the correlation between mendel’s factors, what they might be, and why pea plant traits come in one form or another—e. g., gray or dark red—rather than blended.