It takes place between nonhomologous chromosomes and results in an increased gene mutation rate. It takes place between nonhomologous chromosomes and results in new gene combinations. 4 White short-horned cattle and Black Angus cattle have been crossed to produce offspring with superior beef and rapid growth qualities. A structure found in the nucleus of a cell is shown in the diagram at the right. Sometimes a section of a chromosome is lost during meiosis.
Ultraviolet radiation causes skin cells to undergo uncontrolled mitotic division.
A primary sex cell in a human forms a gamete that contains 24 chromosomes. The DNA of a human lung cell undergoes random breakage. A cell in the uterine wall of a human female undergoes a chromosomal alteration. Bacteria that produce colonies containing a red pigment were distributed on nutrient agar and exposed to ultraviolet light for several days. The colonies that developed were red, with the exception of one colony that was white.