Answer to Question 1
One of the best understood examples of a single gene condition is phenylketonuria (PKU), a rare disorder occurring in approximately 1 in 15,000 individuals (Waisbren, 2011). Unlike chromosomal abnormalities that cause Down syndrome, the cause of PKU is a recessive gene transmitted by typical Mendelian mechanisms.
Answer to Question 2
The most common disorder that results from a chromosome abnormality is Down syndrome. These abnormalities also can occur in the number of sex chromosomes, resulting in intellectual disability syndromes such as Klinefelter's (XXY, a disorder in which males have an extra X chromosome) and Turner's (XO, a disorder in which women are missing a second X chromosome).
Variation in climatic conditions result in geographic variation in the distribution of biome types a
Hip Typically occurs as a result of a fall; with osteoporosis, hip fractures can occur as a result o
Sickle cell anemia. The clinical manifestations of sickle cell anemia result from pathologic changes
Glaucoma. (a) A buildup of pressure within the eye cavities, often caused by a blockage of vessels t
Six Levels of Intellectual Skills
Phenotype patterns in the F2 of a dihybrid cross that result from epistatic gene interaction