Biology chapter questions

5 points  

1. After the DNA is replicated, and it condenses in prophase, two identical rods of DNA are seen. These are A.chromatids.B.chromatin.C.spindle fibers.D.centromeres.E.kinetochores. 

   5 points  

   Question 3
   1. In what phases is the genetic material in the cell correctly referred to as chromatids? A.interphase and telophaseB.interphase and prophaseC.metaphase and prophaseD.metaphase and telophaseE.anaphase and metaphase 

      5 points  

      Question 4
      1. Cytokinesis in plant cells differs from cytokinesis in animal cells because A.in plant cells, the cell plate must also divide into two parts.B.the contractile protein, actin, is important only in plant cells.C.plant cells have a rigid cell wall.D.a contractile ring forms only in plant cells.E.there is no difference. 

         5 points  

         Question 5
         1. In humans, a gene that has been identified as causing a type of skin cancer is the A.sonic hedgehog.B.mutant mole rat.C.mutant superman.D.superhero aardvark.E.superwoman echidna. 

            5 points  

            Question 6
            1. Tall corn plants (T) are dominant to dwarf plants (tt). Solid green leaves (G) are dominant to leaves with a white tip (gg). A cross between two corn plants yielded the following phenotypes: 51 tall plants with a white tip on their leaves; 43 dwarf plants with solid leaves; 48 dwarf plants with white tips on their leaves; 45 tall plants with solid leaves. What are the genotypes of the parents that produced these plants? A.TtGg x TtggB.TtGg x TtGgC.None of the aboveD.TtGg x ttggE.ttGG x TTgg 

               5 points  

               Question 7
               1. Duchenne muscular dystrophy (MD) is inherited from an X-linked recessive allele. What is the probability that a son with Duchenne MD inherited this disease from his biological father? A.1/4B.1/2C.1/8D.0E.1/16 

                  5 points  

                  Question 8
                  1. div class="vtbegenerated inlineVtbegenerated">An allele is A.an alternate form of a gene.B.always one of a pair.C.the main factor determining a trait.D.the dominant form of a gene.E.always recessive. 

                     5 points  

                     Question 9
                     1. The genetic makeup of a particular trait in an individual is its A.filial.B.heterozygosity.C.dominance.D.phenotype.E.genotype. 

                        5 points  

                        Question 10
                        1. If you view a cell in which the genetic material is beginning to be visible as separate bodies, and the nucleus has disappeared from view, you may surmise that the cells is in A.prophase.B.anaphase.C.interphase.D.metaphase.E.telophase. 

                           5 points  

                           Question 11
                           1. Special cells found in the gonads that give rise to gametes upon division are called A.basal cells.B.egg cells.C.stem cells.D.somatic cells.E.germ cells. 

                              5 points  

                              Question 12
                              1. Gregor Mendel was successful in his analysis of the genetics of pea plants because A.he studied a trait that had a strange inheritance pattern.B.he decided to only look at his results in an objective manner.C.he examined and analyzed both the F1 and F2 generations.D.he studied the parental plants to determine their differences.E.pea plants have genetics different from other organisms. 

                                 5 points  

                                 Question 13
                                 1. What structure holds the sister chromatids to the spindle fibers? A.

                                    kinetochore

                                    B.

                                    cyclin

                                    C.

                                    centromere

                                    D.

                                    chromatin

                                    E.

                                    MPF

                                     

                                    5 points  

                                    Question 14
                                    1. At the end of metaphase I, _______________ separate. A.sister chromatidsB.germ cellsC.haploid chromatidsD.homologous chromosomesE.centrioles 

                                       5 points  

                                       Question 15
                                       1. Skin cancers typically develop in the A.upper layers of the dermis.B.upper layers of the epidermis.C.lower layers of the dermis.D.lower layers of the epidermis.E.subcutaneous layer. 

                                          5 points  

                                          Question 16
                                          1. If an organism’s diploid chromosome number is 18, how many different possible combinations of homologous chromosomes lining up during meiosis exist for the eggs or sperm produced by that organism? A.9B.512C.128D.36E.18 

                                             5 points  

                                             Question 17
                                             1. The segregation principle states that in sexually reproducing diploid organisms the two copies of each gene A.must always be the same allele.B.separate from each other during mitosis. C.segregate from each other during meiosis.D.will both wind up in either the sperm or egg.E.move together as a unit during meiosis. 

                                                5 points  

                                                Question 18
                                                1. Which of the following statements is true: A.In carriers, the recessive allele causes an intermediate phenotype.B.In recessive genetic disorders, the mother and/or father of an affected individual must also be affected.C.With recessive genetic disorders, if both parents are carriers, the offspring will all be affected.D.The dominant allele is masked in homozygous dominant individuals.E.With dominant genetic disorders, the mother and/or father of an affected individual must also be affected. 

                                                   5 points  

                                                   Question 19
                                                   1. Mendel observed that dominant traits A.are expressed in all plants.B.were absent in the F1 generation of pea plants that he used in his experiments.C.were the only traits seen in the F2 generation of pea plants in his experiments.D.are only expressed in hybrids.E.are seen in all of the F1 hybrid pea plants in his experiments. 

                                                      5 points  

                                                      Question 20
                                                      1. Consider two traits for an organism, determined by two genes, each of which is governed by at least two alleles. In the case of a dihybrid individual, the gametes formed will be of either the parental type or the recombinant type. Recombinant type gametes are formed because of A.the principle of dihybrids.B.independent assortment.C.multiple alleles.D.heterozygosity.E.incomplete dominance.