Explain how the loss of heterozygosity (LOH) leads a cell to become cancerous. What will be an ideal response?
ANSWER: An individual in a heterozygous condition with a predisposition to cancer, may have a mutant
allele present in the germ cells and all the somatic cells. A mutation in the other, normal
allele of the gene might occur, causing the cell to become cancerous. This mutational event is
known as loss of heterozygosity.
You might also like to view...
The change in the chromosome depicted between the top and the bottom in the figure above represents
a(n) ____.
a. inversion b. duplication c. reciprocal translocation d. deletion e. Philadelphia chromosome
An example of commensalism involves which two organisms?
a. acacia trees and ant colonies b. bacteria and legumes c. cattle egrets and cattle d. plants and pollinators e. tapeworms and pigs
Where are the youngest wood and the youngest bark in a tree trunk?
A) Youngest wood is in the center of a tree; youngest bark is the outside of the bark. B) Youngest wood is in the center of a tree; youngest bark is the inner part, next to the vascular cambium. C) Youngest wood is toward the outside, near the vascular cambium; youngest bark is the outside of the bark. D) Youngest wood is toward the outside, near the vascular cambium; youngest bark is the inner part, next to the vascular cambium.
The mucus-producing cells that line the stomach
A) increase the surface area of the stomach for faster digestion. B) stimulate production of hydrochloric acid. C) lubricate and protect the stomach lining. D) move food upward in the stomach to prolong digestion.