BioSc 231 General Genetics Exam 3 Name __________________________________Multiple Choice. (2 points each)_____ Recombination frequencies ___A. are the same for all genes.B. arise from specific genetic exchange.C. are the same for cis and trans heterozygotes.D. decrease with distance._____ A plant of genotype C d/C d is crossed to c D/c D and an F1 testcrossed to c d/c d. If the genes are linked and 40 map units apart, the percentage of C d/c d offspring will beA. 10%B. 20%C. 30%D. 40%E. 50%_____ When an organism gains or loses one of more chromosomes but not a complete haploid set, the conditions is known asA. polyploidyB. euploidyC. aneuploidyD. triploidyE. trisomy_____ When an allotetraploid is backcrossed to one of its progenitor species, a sterile progeny is produced. The genomic composition of this sterile individual can be best represented byA. n1 + n2B. 2n1 + 2n2C. 2n1 D. 2n2E. 2n1 + n2_____ In Drosophila, the two genes w and sn are X-linked and 25 map units apart. A female fly of genotype w+ sn+/w sn is crossed to a male from a wild-type line. What percentage of male progeny will be w+ sn?A. 0B. 12.5%C. 25%D. 37.5%E. 50%_____ It was once thought that the ____ karyotype was related to criminal disposition because it led to aggressive behavior due to excessive "maleness".A. XOB. XYC. XXYD. XYYE. YY_____ Polyploid plants found in nature usually have even numbers of chromosomes because organisms having odd numbers A. exhibit altered mitosisB. are unable to asexually reproduceC. exhibit altered growthD. have low fertilityE. are not viable_____ Out of 800 progeny of a three-point testcross there were 12 double crossover recombinants, whereas 20 had been expected on the basis of no interference. The interference isA. 0.05B. 0.10C. 0.20D. 0.30E. 0.40_____ In a cross of two yeast strains of genotypes c+ a+ X c a the progeny were36 c+ a+40 c a11c+ a13 c a+The frequency of recombination isA. 11%B. 12%C. 24%D. 50%E. 76%_____ Two genes with a 50% recombination frequency areA. Present on homologous chromosomesB. Located close to each otherC. LinkedD. Far apart on a single chromosome_____ In testcross experiments, the frequency of recombination between genes a and d is 0.3; between d and c, 0.2; between c and b, 0.1; between a and c, 0.5; and between b and d, 0.3. What is the order of the three genes?A. c-b-d-aB. d-c-a-bC. a-d-c-bD. b-a-c-dE. a-b-c-d_____ Euploidy isA. a chromosome number that is not an exact multiple of the haploid numberB. an example of aneuploidyC. a chromosome number that is an exact multiple of the haploid number D. the addition of an extra copy of a particular chromosomeE. the absence of a particular copy of a chromosome_____ Calico cats have a patchwork pattern of yellow and black spots. This pattern is an example of A. somatic mutation B. dosage compensationC. mitotic segregationD. all heterozygotes display this phenomenon regardless of sexE. X-inactivation_____ Consider a species with a diploid (2n) number of 20 chromosomes. How many chromosomes would be found in a trisomic body cell?A. 9 B. 10 C. 11 D. 20 E. 21_____ The basic diploid chromosome number in Poinsettia is 16. A new species of Poinsettia is found that has four complete sets of the chromosomes found in the 16 chromosome species (32 chromosomes total). This species is said to beA. haploidB. diploid C. triploidD. tetraploidE. pentaploid_____ Consider a species with a diploid (2n) number of 40 chromosomes. How many chromosomes would be found in a monoploid body cell?A. 10 B. 20 C. 21 D. 19 E. 40_____ Three-point test crossesA. Detect double crossing over eventsB. Require all heterozygous gametesC. Cannot determine gene order on a chromosomeD. Determine goodness of fit_____ Genes ho and dp are 10 map units apart, and genes dp and da are 23 map units apart. What is the probability of a double crossover in these regions?A. 1.3%B. 2.3%C. 3.4%D. 4.5%E. 5.6%_____ In Drosophila, the genes r and s are linked. Flies of genotype r+ s+/ r+ s+ and r s/ r s are crossed and an F1 obtained. The F1 allele arrangement is calledA. cisB. transC. recombinantD. complementary_____ The Drosophila genes for white eyes (w), tan body (t) and vestigial wings (vg) lie at map positions 2, 12, and 42 respectively. Out of 1000 progeny, 21 exhibited double crossovers. What is the degree of interference?A. 0.10B. 0.20C. 0.30D. 0.40_____ One Drosophila genotype P m/P m is crossed with another genotype p m/p m. If the genes are closely linked A. All progeny will be phenotypically PmB. All progeny will be phenotypically pmC. 50% of the progeny will be phenotypically Pm and 50% phenotypically pmD. None of the above_____ A plant of genotype C D/C D is crossed to c d/c d and an F1 testcrossed to c d/c d. If the genes are unlinked, the percentage of c d/c d recombinants will beA. 10%B. 25%C. 30%D. 40%E. 50%_____ How many different trisomics could be formed in a plant with a diploid number of 10?A. 9 B. 10 C. 11 D. 20 E. 40_____ Which of the following statements is true regarding recombination between genes on homologous chromosomes?A. Equivalent ratios (1:1:1:1) are found in progeny from homozygous dihybrid crossesB. Recombination frequencies are greater than 50%C. 25% of each genotype will appear among the progeny from dihybrid crossesD. Exchange of the middle pair of alleles occurs in double crossoversProblems (variable points each)Two-point testcrosses revealed the following map results:am___________pm 17 map unitspm___________nn 11 map unitsA. Draw the two possible maps for these loci. (2)B. What cross would resolve the two possible maps and what are the possible outcomes of that cross? (1)Consider a fully heterozygous flowering plant with normal blue flowers and round seeds. This plant, when crossed with one that has red flowers and oval seeds, results in the following progeny:91 blue, round92 red, round93 blue, oval94 red, ovalA. What is the recombination frequency? (1)B. Are these genes linked? (1)What gametes are produced by an individual with the genotype k L/K l if the genes are A) linked (no crossing over) and B) unlinked? (2)Several testcrosses have revealed the rate of recombination for the following genes:k-m 0.06k-l 0.08l-m 0.13What is the order of the three genes? (2)A series of two-point mapping crosses indicated the following map distances between 6 genes, A through F. (5)A - G 20 muC - A 7 muA - E 5 muB - F 20 muD - F 10 muC - E 12 muC - G 27 muD - B 30 muDraw a map(s) for all the genes showing the correct