Bio 211 Exam 3 Practice Questions and Correct Answers

The precise location of a gene on a chromosome is known as its _____. a. loci b. trait c. sequence d. character a. loci A human cell contains 22 pars of autosomes, one X chromosome, and one Y chromise is a(n) _____. a. egg cell b. sperm cell c. male somatic cell d. femaile somatic cell c. male somatic cell The frequency with which crossing over occurs between any two linked genes is _____. a. the same as if they were not linked b. different between males and females c. determinded by their relative dominance d. proportional to the distacne between the genes d. proportional to the distacne between the genes During meiosis, homologous chromosomes sometimes "stick together" and do not seperate properly. This disorder is know as ____. a. meiotic failure b. nondisjunction c. cellular sterility d. gamete infertility b. nondisjunction A couple who are both carriers for the gene for cystic fibrisis have two children who have cystic fibrosis. What is the probability that their next child will be a carrier for this recessive genetic disorder? a. 0% b. 25% c. 50% d. 100% b. 50% A chromatid is a(n) ______. a. replicated chromosome b. chromosome in the G1 pahse of the cell cycle c. chromosome found outside of the cell nucleus d. attachment point for a kinetochore microtuble a. replicated chromosome