Biology 203: Final Exam Review 151 Questions with Correct Answers

Biology 203: Final Exam Review 151 Questions with Correct Answers What cellular events occur in the G1 phase of the cell division cycle? - Correct Answers normal growth and cell function What is the best way to describe homologous chromosomes? - Correct Answers they carry information for the same traits In some parts of Africa, the frequency of individuals who are heterozygous for the sickle-cell anemia allele is higher than the frequency in North America, presumably because this reduces the frequency of malaria. Such a relationship is related to what? - Correct Answers Darwin's theory of natural selection Red-green color blindness is an X-linked recessive trait in humans. Two people with normal color vision have a son with colorblindness. Given this information, the genotypes of the parents are ________________. - Correct Answers X^N X^n and X^N Y What investigator was responsible for determining that DNA contains equal amounts of adenine and thymine, and equal amounts of guanine and cytosine? - Correct Answers Erwin Chargaff What is a nondisjunction? - Correct Answers An error in cell division that causes homologous chromosomes or sister chromatids to move to the same side of the dividing cell When can nondisjunction occur? - Correct Answers In mitosis and meiosis, when sister chromatids fail to separate & in meiosis, when homologous chromosomes fail to separate. What syndrome is characterized by the XO chromosome abnormality? - Correct Answers Turner syndrome What kind of cell results when a diploid and a haploid gamete fuse during fertilization? - Correct Answers A triploid cell What type of chromosomal abnormalities is most likely to be viable in humans? - Correct Answers trisomy