Lynch syndrome is an inherited condition associated with an increased risk for colon cancer, as well as certain other cancers Mutations in one of several genes involved in DNA repair during DNA replication have been associated with Lynch syndrome. DNA sequencing was performed for an individual. The results indicated that the individual carries one of the dominant aleles that has been associated with Lynch syndrome. Which of the following best explains how the results should be interpreted?
(A) The individual does not have an increased risk of developing cancer because one dominant allele is insufficient to cause the disease
(B) The individual has an increased risk of developing colon cancer
(C) Because the person's DNA has the mutation, other family members must have cancer.
(D) Results cannot be interpreted until testing determines if additional mutated alleles are present

B. The individual has an increased risk of developing colon cancer.

Explanation:

The presence of mutations associated with this syndrome increases the probabilities to have colon cancer

1) gene flow

- it is described as the transfer of genes from one population to another population so that frequency of gene is increased.

-a zebra migrates to join a different herd of zebras.

2) natural selection

- a mechanism of evolutionary change in which individuals with advantageous traits survive and reproduce whereas the others ( those that can not adapt) eliminate from the population.

-competition for sunlight leads to taller trees.

3) mutation

- permanent change in the nucleotide sequence of dna ( genetic material) that could have harmful or useful consequences.

-the dna of a snake changes to make its venom stronger.

4) genetic drift - it is a random phenomenon ( that occurs by chance such as fire) that results in change in the gene frequency in a small population.    

-a grassfire randomly sweeps through a population of buffalo and kills most of the animals.

explanation: