Sometimes errors called mutations occur during DNA replication. What are some of the possible consequences of mutations?

Possible consequences of mutations include nothing happening, a small change (usually neutral), and a harmful (or helpful) change. Mutations may or may not be expressed in the phenotype of the organism.

Explanation:

Some causes of mutations can lead to genetic disorders or cancer.

a tetrad is the foursome during meiosis made by two homologous chromosomes that have each already replicated into a pair of sister chromatids.