Midterm Study Guide for SCI 225 updated verified to pass

Midterm Study Guide for SCI 225 updatedHeterozygous having two different alleles for a trait Homozygous having two identical alleles for a trait Genotype genetic makeup of an organism Phenotype physical characteristics of an organism Allele Different forms of a gene Klinefelter syndrome A chromosomal disorder in which males have an extra X chromosome, making them XXY instead of XY. Down Syndrome caused by an extra copy of chromosome 21 Turner Syndrome A chromosomal disorder in females in which either an X chromosome is missing, making the person XO instead of XX, or part of one X chromosome is deleted. Cri du chat syndrome deletion on chromosome 5 Huntington's disease A human genetic disease caused by a dominant allele; characterized by uncontrollable body movements and degeneration of the nervous system; usually fatal 10 to 20 years after the onset of symptoms. cystic fibrosis A genetic disorder that occurs in people with two copies of a certain recessive allele; characterized by an excessive secretion of mucus and consequent vulnerability to infection; fatal if untreated. Duchenne muscular dystrophy a condition with symmetrical weakness and wasting of pelvic, shoulder, and proximal limb muscles neruofibromatosis autosomal dominant disorder where nerves tend to grow tumors