DNA: Proofreading and Repairing

Source: Urry, Lisa A.. Campbell Biology (p. 327). Pearson Education. Kindle Edition. Campbell Biology We cannot attribute the accuracy of DNA replication solely to the specificity of base pairing. Initial pairing errors between incoming nucleotides and those in the template strand occur at a rate of one in 100,000 nucleotides. However, errors in the completed … Continue reading DNA: Proofreading and Repairing

Diseases From Altered Chromosomes: Cri Du Chat and Chronic Myelogenous Leukemia

The cancerous cells in nearly all CML patients contain an abnormally short chromosome 22, the so-called Philadelphia chromosome, and an abnormally long chromosome 9. These altered chromosomes result from the reciprocal translocation shown here, which presumably occurred in a single white blood cell precursor undergoing mitosis and was then passed along to all descendant cells. … Continue reading Diseases From Altered Chromosomes: Cri Du Chat and Chronic Myelogenous Leukemia

Did You Know: Cat With Curled-Back Ears

Source: Urry, Lisa A.. Campbell Biology (p. 293). Pearson Education. Kindle Edition. Campbell Biology In 1981, a stray black cat with unusual rounded, curled-back ears was adopted by a family in California. Hundreds of descendants of the cat have since been born, and cat fanciers hope to develop the curl cat into a show breed. … Continue reading Did You Know: Cat With Curled-Back Ears

Fetal Testings For Genetic Disorders: Amniocentesis and Chorionic Villus Sampling

Biochemical tests may detect substances associated with particular disorders, and genetic testing can detect many genetic abnormalities. Karyotyping shows whether the chromosomes of the fetus are normal in number and appearance. Source: Urry, Lisa A.. Campbell Biology (p. 289). Pearson Education. Kindle Edition. Campbell Biology Suppose a couple expecting a child learns that they are … Continue reading Fetal Testings For Genetic Disorders: Amniocentesis and Chorionic Villus Sampling

Evolutionary Implications of Sickle-Cell Disease

Source: Urry, Lisa A.. Campbell Biology (p. 286). Pearson Education. Kindle Edition. Campbell Biology The most common inherited disorder among people of African descent is sickle-cell disease, which affects one out of 400 African-Americans. Sickle-cell disease is caused by the substitution of a single amino acid in the hemoglobin protein of red blood cells; in … Continue reading Evolutionary Implications of Sickle-Cell Disease

How Karyotypes Are Prepared?

Campbell Biology A karyotype is a display of condensed chromosomes arranged in pairs. Karyotyping can be used to screen for defective chromosomes or abnormal numbers of chromosomes associated with certain congenital disorders, such as Down syndrome. Source: Urry, Lisa A.. Campbell Biology (p. 256). Pearson Education. Kindle Edition In the picture above, karyotypes are prepared … Continue reading How Karyotypes Are Prepared?

Cell Loses Cycle Control and Becomes Cancerous

Campbell Biology A series of genetic and cellular changes contribute to a tumor becoming malignant (cancerous). The cells of malignant tumors grow in an uncontrolled way and can spread to neighboring tissues and, via lymph and blood vessels, to other parts of the body. The spread of cancer cells beyond their original site is called … Continue reading Cell Loses Cycle Control and Becomes Cancerous

News: Scientists Identified Genes Associated With Parkinson’s Disease

Source: Image by Raman Oza from Pixabay By: Ana Pena, Ph.D Researchers have found new gene networks associated with the development of Parkinson’s disease, which may help them understand the underlying mechanisms of this neuro-degenerative disorder and identify potential new therapeutic targets. The study, “The landscape of multiscale transcriptomic networks and key regulators in Parkinson’s disease,” … Continue reading News: Scientists Identified Genes Associated With Parkinson’s Disease

News: E. coli Engineered To Consume Carbon Dioxide

Source: https://www.livescience.com/64436-e-coli.html Authors: Shmuel Gleizer, Roee Ben-Nissan, Yinon M. Bar-On, Melina Shamshoum, Arren Bar-Even, Ron Milo The living world is largely divided into autotrophs that convert CO2 into biomass and heterotrophs that consume organic compounds. In spite of widespread interest in renewable energy storage and more sustainable food production, the engineering of industrially relevant heterotrophic model … Continue reading News: E. coli Engineered To Consume Carbon Dioxide