Natural selection and speciation: 'Ecological speciation'. ... Natural selection is generally recognized as a central mechanism of evolutionary change within species. Thus, natural selection plays a major role in generating the array of phenotypic and genetic diversity observed in nature.
sister chromatids are introduced during the (S) or synthesis phase of cell division. The two sister chromatids are separated from each other into two different cells... O <--> O
during mitosis or during the second division of meiosis.
So no, they are apart of a phase, but aren't the entirety of cell division.
If this cancer is associated with an inherited mutation, the expected results of genome sequencing is his normal cells are heterozygous for a loss-of-function allele of a tumor-suppressor gene.
Option A
<h3><u>Explanation:</u></h3>
Oncogenes are defined as the genes that are responsible for production of different proteins that are responsible for the formation of cancers and tumours in the body of a human. Tumour suppressor genes are the genes that are responsible for the production of certain proteins that are responsible to suppress the expression of Oncogenes.
In this person, he had a genetic defect in one of the alleles of a Tumour suppressor gene. This leads in the inability of suppression of the Oncogenes of that person, which produce the colon cancer. As this defect is congenital and hereditary, persons sharing his genes are all having defected allele of TSG. Thus this heredity suffers a colon cancer history running in their family.
Answer:
In 1831, Charles Darwin embarked on an expedition that, in his own words, determined my whole career. The Voyage of the Beagle chronicles his five-year journey around the world and especially the coastal waters of South America as a naturalist on the H.M.S.
Explanation:
