Unit 3 quizzes 1 During anaphase of mitosis what happens a The centrioles are at opposite places b c A spindle made of microtubules d The centromeres divide e All the above Identical chromatids move to opposite poles you saw that what happened It had formed a cell plate It had formed a cleavage furrow It had two pairs of centrioles during prophase a b c d The nucleolus was visible during metaphase e It had microtubules 2 You would know a dividing cell was a plant cell rather than an animal cell if 3 If a cell contains 60 chromatids at the start of mitosis how many chromosomes will be found in each daughter cell at the completion of the cell cycle a 30 b 15 c 120 d 45 e 60 4 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 division 5 A cell entering the cell cycle with 32 chromosomes will produce two daughter cells each with what a None of these b 64 pairs of chromosomes c 32 pairs of chromosomes d 16 chromosomes e 32 chromosomes a 50 units b 400 units c 200 units d Between 50 and 100 units e 100 units 6 A cell biologist carefully measured the quantity of DNA in grasshopper cells growing in cell culture Cells examined during the G2 phase of the cell cycle contained 200 units of DNA What would be the amount of DNA at G1 of the cell cycle in one of the grasshopper daughter cells 7 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 8 A biochemist measured the amount of DNA in cells growing in the laboratory and found that the quantity of DNA in the cells doubled a Between prophase and anaphase b Between the G2 phase and prophase c Between anaphase and telophase d Between the G1 and G2 phases e During the M phase of the cell cycle 9 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 10 If a somatic human cell is just about to divide it has how many chromatids a There is insufficient information to answer the question b 92 c 23 d 0 e 46 11 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 d The two daughter cells produced at the end of meiosis 1 are different from each other but the two cells produced in meiosis 2 are identical e Only meiosis 1 occurs in males but both meiosis 1 and meiosis 2 telophase occur in females 12 Mitosis results in the formation of meiosis results in the formation of a Two diploid cells two haploid cells b Four haploid cells two diploid cells c Two diploid cells four haploid cells d Two diploid cells two diploid cells e Four diploid cells four haploid cells 13 A human somatic cell contains what a 21 autosomes and 2 sex chromosomes b 44 autosomes and 2 sex chromosomes c 22 autosomes and 1 sex chromosomes d 45 autosomes and 1 sex chromosomes e n chromosomes 14 Which one of the following occurs in meiosis but not mitosis a Sister chromatids undergo disjunction b A spindle apparatus forms c The nuclear envelope disappears d The cells formed have the same combination of genes as found in the initial cell e Homologous chromosomes separate 15 In sexually reproducing species the chromosome number remains stable over time because and always alternate a Meiosis mitosis b Meiosis fertilization c Meiosis 1 Meiosis 2 d Meiosis interphase e Mitosis fertilization 16 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 17 In a diploid cell containing 10 chromosomes meiosis results in the formation of daughter cells containing how many chromosomes a 0 b 10 c 40 d 20 e 5 a 20 b 80 c 40 d 30 e 10 18 What is the function of meiosis a None of these b To make cells with a haploid half that of the parents number of c To make exact copies of the parent cell d To make four cells with the same chromosome number as the parent e To make one cell with twice the number of chromosomes as the chromosomes parent pairs 19 If there are 20 chromatids in a cell in G2 how many centromeres are there 20 Humans have 46 chromosomes That number of human chromosomes will be found in a All the cells of the body b All the egg and sperm cells c Liver cells d All gamete producing cells after meiosis 1 21 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 22 Pea plants were particularly well suited for use in Mendel s breeding experiments for all of the following reasons except that a It is possible to completely control matings between different pea plants It is possible to obtain large numbers of progeny from any given cross b c Peas have an unusually long generation time d Many of the observable characters that vary in pea plants are e Peas show easily observed variations in a number of characters such controlled by single genes as pea shape and flower color 23 All the offspring of a cross between a black eyed MendAlien and an orange eyed MendAlien have black eyes This means that the allele for black eyes is the allele for orang eyes a A more aggressive than b Dominant to c Better than d Codominant to e Recessive to 24 A cross between homozygous purple flowered and homozygous white flowered pea plants results in offspring with purple flowers This demonstrates what 25 A plant with purple flowers is allowed to self pollinate Generation after generation it produces purple flowers This an example of what a The mistakes made by Mendel b Dominance c A …
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