Question

mutations may also occur in chromosomes (figure, right). these mutations are going to be fairly large mutations, possibly affecting many genes. possible types of mutations in chromosomes include 1. deletion: when a segment of dna is lost, so there is a missing segment in the chromosome. these usually result in many genes missing from the chromosome. 2. duplication: when a segment of dna is repeated, creating multiple copies of genes in the chromosome. these usually result in multiple copies of genes in the chromosome. 3. inversion: when a segment of dna is flipped and then re - inserted into the same chromosome. 4. insertion: when a segment of dna from one chromosome is added to another, unrelated chromosome. 5. translocation: when two segments from different chromosomes change positions. causes of mutations many mutations are not caused by errors in replication. mutations can happen spontaneously, and they can be caused by mutagens in the environment. some chemicals, such as those found in tobacco, can be mutagens. sometimes mutagens can also cause cancer. tobacco, for example, is often linked to lung cancer. review questions (2 points): 1. what can cause dna to mutate?

Explanation:

The text mentions that many mutations are spontaneous and can be caused by mutagens in the environment like certain chemicals in tobacco.

Answer:

Mutations can be spontaneous or caused by mutagens in the environment such as certain chemicals.