Human Genetics and Disorders

Women with Turner syndrome are essentially postmenopausal from early childhood and are sterile because their ovaries do not develop normally and they do not ovulate.

This progressive disease characterized by degeneration of brain cells resulting in severe memory loss usually occurs in old age for normal people if it occurs at all. It is far more common among Down syndrome sufferers and it occurs at an earlier age.

It is the mostly inherited and genetic disorder that impairs the body's ability to form blood clots, a process needed to stop bleeding when a blood vessel is broken.

Correct Answer: Baldness in males

Haemophilia A, also called factor-VIII deficiency or classic haemophilia, is a genetic disorder that is caused by missing or defective factor-VIII, a clotting protein.

Sex-linked genetic disorders are conditions that are caused by a defective gene on the X chromosome, one of the sex chromosomes. These disorders may also involve a deviation in the number of X or Y chromosomes, such as haemophilia and colour blindness.

The chromosomes in the nucleus of a cell contain information for inheritance of features from parents to the next generation in the form of DNA (Deoxyribo Nucleic Acid) molecules.

This disorder occurs as the result of mutations in multiple genes, frequently coupled with environmental causes. An example of a multifactorial disorder is diabetes.

Haemophilia is a hereditary bleeding disorder in which there is a partial or total lack of an essential blood clotting factor. It is a lifelong disorder  that results in excessive bleeding. Due to the sex-linkage of the disorder, there is a greater prominence in males than in females.

CAG/CTG repeat expansions at the Huntington's disease (HD)-like 2 locus have been identified in this gene, which is a member of the junctophilin gene family.

ATC to GTC is isoleucine to valine both are nonpolar amino acids and therefore this substation is most likely to be conservative.

UV exposure leads to thymidine dimers. Thymidine dimer are molecular lesions formed from thymine or cytosine bases in DNA via photochemical reactions. Ultraviolet light induces the formation of covalent linkages by reactions localised on the C=C double bonds.

Homologous repeats (low-copy repeats, or LCRs) flank areas of deletion because they can lead to nonallelic homologous recombination events.

Apparently apo E4 binds more avidly to beta-amyloid found in neuritic plaques.  Beta-amyloid (Aβ) deposits are the fundamental cause of the alzheimer's disease

Deficiency of beta-galactosidase leads to Krabbe's disease. Clinical symptoms of the disease are mental retardation and myelin is almost absent.