Essays on Pentose

Bio Exam

Codominant traits exist when two different alleles for a genetic trait such as flower colour, and hair texture are both expressed. The expression of codominance infers a relationship between two types of a gene. In codominance, the phenotypes of both alleles inherited from the parents are expressed ("Codominance - Glossary Entry", 2016).

Genetic expression feather colors in purple penguin ("Basic Principles of Genetics: Probability of Inheritance", 2016).

With the order of dominance as pd>pm>pl>pvl a 1 dark: 1 medium ration of phenotype among the baby penguins is expected. Marfan Syndrome is a genetic disorder that exhibits variation among affected individuals. The range of phenotypic severities is an example of variable expressivity. ...

Q. 1. Explain how gel filtration chromatography (size exclusion chromatography) separates molecules on the basis of their mass/size.

A. In gel filtration, porous beads are packed into a column. The pores are of different size. The column is then packed with a buffer solution. This buffer solution is present inside the beads as well as around it. When molecules of different size pass through the columns, the smaller molecules pass through the pores and take a longer path. The larger molecules, however, travel around the beads. Thus, larger molecules travel faster than the ...

1) Proto-Oncogenes and Tumor Suppressor Genes are two types of genes that ordinarily keep the cell cycle functioning as it should. Explain the roles of these two types of genes, and explain what can occur when these types of gene are not working properly. Provide at least two different examples of cancers associated with mutations of these types of genes.

The purpose of the proto-oncogenes under normal circumstances is to make sure that cells proliferate, in other words the oncogenes stimulate cell production. But when a normal, healthy ocogene cell becomes mutated or expresses at higher than normal levels it causes cancer. The first oncogenic virus was discovered in 1916 and called the Rous virus after the person who discovered it, Peyton Rous. Rous viruses represent a family of viruses called the retro viruses. Retro viruses contain a genetic material called ribonucleic acid (RNA).

There is always the possibility that RNA will be transcribed into DNA (deoxyribonucleic acid) by an enzyme of ...