1 2 3 4 5 1 The double helix is antiparallel This refers to the directionality of the two strands True or false 2 What is the probability that a male will inherit an X linked recessive allele from his father a True b False a 0 b 25 c 75 d 50 e 100 3 Crossing over is a The exchange of homologous portions of nonsister chromatids b Also referred to as the independent assortment of chromosomes c A direct consequence of the separation of sister chromatids d Making an RNA copy of a DNA strand e The movement of genetic material from one chromosome to a nonhomologous chromosome 4 One strand of a DNA molecule has the base sequence 5 ATAGGT 3 The complementary base sequence on the other strand of DNA will be 3 5 a UAUCCA b TATCCA c TGGAUA d ATAGGT e TGGATA 5 One difference between meiosis 1 and meiosis 2 is that a Crossing over occurs in meiosis 1 but not in meiosis 2 b Chromosomes line up at the metaphase plate during meiosis 1 but remain dispersed throughout the cell during meiosis 2 c Only meiosis 1 includes prophase metaphase anaphase and telophase d The two daughter cells produced at the end of meiosis 1 are different from each other but the two cells produced in 6 7 8 9 10 6 meiosis 2 are identical e Only meiosis 1 occurs in males but both meiosis 1 and meiosis 2 occur in females In cattle roan coat color mixed red and white hairs occurs in the heterozygous Rr offspring of red RR and white rr homozygotes Which of the following crosses would produce offspring in the ratio of 1 red 2 roan 1 white a Red X roan b Roan X roan c The answer cannot be determined from the information provided d Red X white e White X roan 7 In an X linked or sex linked trait it is the contribution of that determines whether a son will display the trait a None of these b The mother c The father d The paternal grandfather e The paternal grandmother 8 The centromere is region in which what happens a The chromosomes are connected to the cell plate in metaphase b Sister chromatids are attached to one another in prophase c The new cell plate forms in telophase d Chromosomes become aligned during metaphase e Microtubules are fastened to the centrioles during anaphase 9 Chargaff found that for DNA a The ratio of A to G is close to 1 1 and the ratio of T to C is close to 1 1 b The ratio of A to T is close to 1 1 and the ratio of G to C is close to 1 1 c A T 50 of the total bases d A T G C e The ratio of A to C is close to 1 1 and the ratio of G to T is close to 1 1 10 Transfers the genetic message from the nucleus to the cytoplasm a Transfer RNA 11 12 13 14 15 16 17 18 b Messenger RNA c Ribosomal RNA 11 At G2 there are 40 chromatids At Telophase 2 each daughter cell has how many chromosomes 12 Can a man of blood type O be excluded as the father of a type AB child 13 Both the leading and lagging strands are synthesized 5 to 3 True or false 14 When does Mendelian segregation occur a 80 b 40 c 20 d 10 a Yes b No a True b False a Prophase 1 b Prophase 2 c Anaphase 1 d Anaphase 2 e Metaphase 1 f Metaphase 2 15 tRNA a Adapter molecule recognizing an amino b Transfers the message to the cytoplasm acid and a codon from the nucleus 16 Telomeres a Get longer with continued cell division b Get shorter with continued cell division c Are found in both prokaryotic and eukaryotic cells d Remain the same regardless of the frequency of cell division e Are shorter for younger individuals 17 An XXX female has how many Barr bodies a 1 b 2 c 3 d 0 18 A cross between homozygous purple flowered and homozygous white flowered pea plants results in offspring with purple flowers This demonstrates what a The mistakes made by Mendel b Dominance c A dihybrid cross d The blending model of genetics e True breeding 19 In meiosis when do homologous chromosomes separate a Prophase 1 b Prophase 2 c Anaphase 1 d Anaphase 2 20 A plant with purple flowers is allowed to self pollinate Generation after generation it produces purple flowers This an example of what a The law of segregation b Incomplete dominance c Hybridization d Polygenetics e True breeding 21 If a somatic human cell is just about to divide it has how many chromatids a There is insufficient information to answer the question 22 RNA base not found in DNA b 92 c 23 d 0 e 46 a Thymidine b Uracil c Adenine d Cytosine e Guanine a 20 b 80 c 40 d 30 e 10 23 If there are 20 chromatids in a cell in G2 how many centromeres are there 24 Avery and his colleagues 1944 experiment showed that DNA a Has two strands held together with 19 20 21 22 23 24 hydrogen bonds b Uses three bases to code for one amino c Consists of sugars phosphate groups d Contains adenine guanine thymine and acid and bases cytosine e Was the substance that transformed the bacteria in Griffith s experiment 25 Can a man of blood type A be excluded as the father of a type O child 26 A pairs with what base a Yes b No a A b G c T d C 27 What is the alternative form of a gene a Allele b Centromere c Chromosome d Sister chromatid 28 At which point in the cell cycle do centrosomes begin to move apart to two poles of the cell in a dividing human skin cell a S phase b Anaphase c G2 phase d Prophase e Metaphase 29 The central dogma a DNA is translated into mRNA which is transcribed into proteins b DNA is transcribed into mRNA which is translated into proteins c Study DNA to win the Nobel Prize 30 How many centromeres per chromosome consisting of 2 sister chromatids a 1 b 2 c 3 d 4 31 Which one of the following catalyzes the linkage between ribonucleotides to form RNA during 25 26 27 28 29 30 31 gene expression a RNA ligase b RNA polymerase c Reverse transcriptase d A ribozyme e tRNA 32 Sister chromatids a All of these b Are separated during mitosis c Have matching copies of the chromosome s DNA d Are created when DNA is replicated e Are attached at the centromere prior to 33 The anticodon and codon base pair division a They never pair b Parallel c Anti parallel 34 In mitosis when do homologous chromosome pairs separate a Prophase b Prometaphase c Metaphase d Anaphase e Telophase f It does not …
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