MBG 2040QUIZ 4 ANSWERS.

MBG 2040 / MBG2040 QUIZ 4 ANSWERS Question 1 The process in which chromosomes exchange material through the breakage and reunion of their DNA molecules is called: Crossing Over Gene linkage Replication Assortment Question 2 In regards to linked genes, a dihybrid genotype can occur in two configurations cis and trans, however the configuration of the alleles has no impact on the gametes produced by the dihybrid individual. False True Question 3 The genes for red hair and freckles both exhibit typical dominant-recessive patterns however these traits tend to be inherited together. This is likely due to: A family history of red hair and freckles Independent Assortment Recombination Question 4 While studying two traits in flowers petal colour and leaf shape you notice that while both traits exhibit clear dominance patterns (blue petal > white petals, heart shaped leafs > oval leafs) the 2nd generation progeny of a dihybrid cross does not display the typical 9:3:3:1 phenotypic ratios that you would expect. It appears as though progeny are much more likely to exhibit one of the parental phenotypes. This is likely due to: Gene linkage Recombination Independent assortment Cross-over Gamete Production Question 5 In a rare variety of orchid pink flowers (P) are dominant over green and the presence of black spots (S) is dominant over no spots. These two genes responsible for petal colouring are both located on Chromosome 2. Two pink spotted plants are crossed and the phenotypes of the F1 plants are recorded as follows: Pink, spotted: 144 Pink, un-spotted: 9 Green, spotted: 7 Green, un-spotted: 37 What are the genotypes of the P generation? Ps//pS x Ps//pS PS//PS x PS//ps pS//Ps x PS//ps Gamete frequency Question 6 In Drosophila two recessive mutations, rose wings (rs) and curled wings (cu), are located 17 cM apart on chromosome 3. What gametes and at what frequency would be produced by a fly with the following genotype RScu//RSCU? RScu 83%; RSCU 17% RScu 41.5%; RSCU 41.5%; rscu 8.5% ; rsCU 8.5% RScu 41.5% ; RSCU 41.5% ; RSRS 8.5% RScu 17% ; RSCU 83% Question 7 In tomato plants the genes for hairless (hl) and leafy (lf) are located 6 cM apart on chromosome 5. What gametes and at what frequency would be produced by a self-pollinated plant with the following genotype HLLF//hlLF? HLLF 47%; hlLF 47%; HLlf 3%; hlLF 3% HLLF 6%; hlLF 6%; HLlf 47%; hlLF 47% HLLF 47%; hlLF 47%; HLLF 6%; hlLF 6% HLLF 47%; hllf 47%; HLlf 3%; lfLF 3% Math 1 Question 8 In mice short tails (T) are dominant over long and a solid (S) coat is dominant over a spotted coat. These two genes T and S are located on the same chromosome, 39 map units apart. One particular mouse has a short tail and a solid coat with the following genotype TS//ts. What proportion (%) of this mouse’s gametes will be Ts? (One decimal place) Your Answer: Question 9 (19.5) Math 2 In mice short tails (T) are dominant over long and a solid (S) coat is dominant over a spotted coat. These two genes T and S are located on the same chromosome, 36 map units apart. If a short tail, solid coat (TS//ts) is crossed with a long tailed, spotted coat (ts//ts) what percentage of the F1 progeny would be short tailed, spotted? (One decimal place) Your Answer: (18.0) Question 10 In a rare variety of orchid two genes responsible for petal colouring show linked assortment. Pink flowers (P) are dominant over green and the presence of black spots (S) is dominant over no spots. After a dihybrid cross (PS//ps X PS//ps) you record the phenotypes of the F1 progeny in order to map these genes. Based on the following observations calculate the distance between these two genes in map units; one decimal place. Pink, Spotted: 299 Pink, no spots: 15 Green, Spotted: 1 Green,no spots: 111 Your Answer: (3.8) Question 1 The image above depicts chromosomes in what phase of cell division ? Metaphase of mitosis Anaphase II of meiosis Anaphase of mitosis Prophase of mitosis Prophase II of meiosis Metaphase I of meiosis Question 2 While studying two traits in peas; plant height and flower colour you determine that each trait exhibits typical dominance. The tall phenotype (T) is dominant over short (t) and purple flowers (W) is dominant over white flowers (w). You record the phenotypes of the progeny of a dihybrid cross and obtain the following data: Tall, Purple: 73 Tall, White: 4 Short, Purple: 7 Short, white: 21 This suggests: That these two genes are found on separate chromosomes Independent Assortment That these two genes are approximately 20 cM apart on the same chromosome Question 3 What process is occurring in the image above? Chromosome replication cross-over between sister chromatids separation of sister chromatids separation of homologous chromosomes Question 4 What is the structure/s indicated by the red circle in the image above? Crossing Over Sister Chromatids heterochromatin Gamete Production Question 5 In Drosophila two recessive mutations, rose wings (rs) and curled wings (cu), are located 12cM apart on chromosome 3. What gametes would be produced by a fly heterozygous at both loci with the following configuration RSCU//rscu? RScu; rsCU RSCU; rscu; RScu RSCU; rscu Gamete frequency Question 6 In Drosophila two recessive mutations, rose wings (rs) and curled wings (cu), are located 25 cM apart on chromosome 3. What gametes and at what frequency would be produced by a fly with the following genotype RScu//rscu? RScu 37.5%; rscu 37.5%; RSCU 12.5% ; rsCU 12.5% RScu 75%; rscu 25% RScu 37.5% ; rscu 37.5% ; RSrs 12.5% ; cucu 12.5% RScu 25% ; rscu 75% Question 7 In tomato plants the genes for hairless (hl) and leafy (lf) are located 24 cM apart on chromosome 5. What gametes and at what frequency would be produced by a self-pollinated plant heterozygous at both loci with the following configuration HLlf//hlLF? HLLF 38%; hllf 38%; HLlf 12%; hlLF 12% HLLF 24%; hllf 24%; HLlf 76%; hlLF 76% HLLF 76%; hllf 76%; HLlf 24%; hlLF 24% HLLF 12%; hllf 12%; HLlf 76%; hlLF 76% HLlf 50%; hlLF 50% Math 1 Question 8 In mice short tails (T) are dominant over long and a solid (S) coat is dominant over a spotted coat. These two genes T and S are located on the same chromosome, 23 map units apart. One particular mouse has a short tail and a solid coat with the following genotype Ts//tS. What proportion (%) of this mouse’s gametes will be ts? (One decimal place) Your Answer: Question 9 Math 2 In mice short tails (T) are dominant over long and a solid (S) coat is dominant over a spotted coat. These two genes T and S are located on the same chromosome, 33 map units apart. If a short tail, solid coat mouse (Ts//tS) is crossed with a long tailed, spotted coat mouse (ts//ts) what percentage of the F1 progeny would be long tailed, solid coat? (One decimal place) Your Answer: (33.5) Question 10 In a rare variety of orchid two genes responsible for petal colouring show linked assortment. Pink flowers (P) are dominant over green and the presence of black spots (S) is dominant over no spots. After a dihybrid cross (PS//ps X PS//ps) you record the phenotypes of the F1 progeny in order to map these genes. Based on the following observations calculate the distance between these two genes in map units; one decimal place. Pink, Spotted: 297 Pink, no spots: 5 Green, Spotted: 10 Green,no spots: 82 Your Answer: (3.8) Question 1 Homologous recombination occurs in which phase of meiosis? Anaphase I Metaphase I Prophase I Metaphase II Prophase II Anaphase II Question 2 While studying two traits in peas; plant height and flower colour you determine that each trait exhibits typical dominance. The tall phenotype (T) is dominant over short (t) and purple flowers (W) is dominant over white flowers (w). After continued research you also determine that a particular individual plant has the following genotype: Tw//tW. What terminology would be used to describe this genotype? dihybrid; trans configuration dihybrid; cis configuration monohybrid; trans configuration monohybrid; cis configuration Question 3 The recombination of genetic material that leads to non-parental phenotypes occurs between: Non-homologous chromosomes Sister Chromatids Homologous Chromosomes Daughter Cells Question 4 While studying two traits in peas; plant height and flower colour you determine that each trait exhibits typical dominance. The tall phenotype (T) is dominant over short (t) and purple flowers (W) is dominant over white flowers (w). You notice that the progeny of a dihybrid cross (TtWw X TtWw) exhibit a phenotypic ratio of 9:3:3:1. This suggests: Independent assortment of alleles Recombination Cross-over Linked Assortment of alleles Gamete Production Question 5 In Drosophila two recessive mutations, rose wings (rs) and curled wings (cu), are located 12cM apart on chromosome 3. What gametes and at what frequency would be produced by a rose coloured and curled wing fruit fly? rscu 100% rscu 88%; RSCU 12% RScu 6% ; rsCU 6% ; rscu 44% ; RSCU 44% RScu 12% ; rsCU 12% ; rscu 88% ; RSCU 88% Gamete frequency Question 6 In Drosophila two recessive mutations, rose wings (rs) and curled wings (cu), are located 12cM apart on chromosome 3. What gametes and at what frequency would be produced by a fly with the following genotype RSCU//rscu? RSCU 88%; rscu 12% RSCU 6% ; rscu 6% ; rsCU 44% ; RScu 44% RSCU 12% ; rscu 12% ; rsCU 44% ; RScu 44% RSCU 44%; rscu 44%; rsCU 6%; RScu 6% RSCU 50%; rscu 50% Question 7 In Drosophila two recessive mutations, rose wings (rs) and curled wings (cu), are located 20cM apart on chromosome 3. What gametes and at what frequency would be produced by a fly with the following genotype RScu//rsCU? RScu 50%; rsCU 50% RSCU 40% ; rscu 40% ; rsCU 10% ; RScu 10% RScu 40%; rsCU 40%; RSCU 10%; rscu 10% RScu 80%; rsCU 20% RScu 20% ; rsCU 20% ; RSCU 40% ; rscu 40% Math 1 Question 8 In mice short tails (T) are dominant over long and a solid (S) coat is dominant over a spotted coat. These two genes T and S are located on the same chromosome, 8 map units apart. One particular mouse has a short tail and a solid coat with the following genotype TS//ts. What proportion (%) of this mouse’s gametes will be ts? (One decimal place) Your Answer: Question 9 (46.0) Math 2 In mice short tails (T) are dominant over long and a solid (S) coat is dominant over a spotted coat. These two genes T and S are located on the same chromosome, 9 map units apart. If a short tail, solid coat mouse (Ts//tS) is crossed with a long tailed, spotted coat mouse (ts//ts) what percentage of the F1 progeny would be short tailed, spotted? (One decimal place) Your Answer: (45.5) Question 10 In a rare variety of orchid two genes responsible for petal colouring show linked assortment. Pink flowers (P) are dominant over green and the presence of black spots (S) is dominant over no spots. After a dihybrid cross (PS//ps X PS//ps) you record the phenotypes of the F1 progeny in order to map these genes. Based on the following observations calculate the distance between these two genes in map units; one decimal place. Pink, Spotted: 283 Pink, no spots: 7 Green, Spotted: 7 Green,no spots: 89 Your Answer: (3.6) Question 1 While studying two traits in peas; plant height and flower colour you determine that each trait exhibits typical dominance. The tall phenotype (T) is dominant over short (t) and purple flowers (W) is dominant over white flowers (w). After continued research you also determine that a particular individual plant has the following genotype: TW//tw. What terminology would be used to describe this genotype? double homozygous; cis configuration dihybrid; cis configuration double heterozygous; trans configuration dihybrid; trans configuration Question 2 The production of gene combinations not found in the parental generation is called: Replication Gene linkage Linked Assortment Recombination Question 3 While recombination rates can be used to map genes to a chromosome this method could not be used to map other genetic markers such as SNPs and RFLPs. False True Question 4 The physical junction between homologous chromosomes where cross-over of genetic material occurs is called the: Recombination Chromatid Chiasma Recombinant chromosome Gamete Production Question 5 In a rare variety of orchid pink flowers (P) are dominant over green and the presence of black spots (S) is dominant over no spots. These two genes responsible for petal colouring are both located on Chromosome 2. A pink spotted plant is crossed with a green spotted plant and the phenotypes of the F1 plants are recorded as follows: Pink, spotted: 46 Pink, un-spotted: 0 Green, spotted: 53 Green, un-spotted: 0 What are the genotypes of the P generation? Ps//pS x pS//pS pS//Ps x pS//ps Ps//pS x Ps//pS PS//PS x PS//ps Gamete frequency Question 6 In tomato plants the genes for hairless (hl) and leafy (lf) are located 13 cM apart on chromosome 5. What gametes and at what frequency would be produced by a self-pollinated plant with the following genotype hllf//HLlf? hllf 43.5%; HLlf 43.5%; HLlf 6.5%; hlLF 6.5% hllf 50%; HLlf 50% HLlf 43.5%; hlLF 43.5%; hllf 6.5%; HLLF 6.5% hllf 6.5%; HLlf 6.5%; HLLF 43.5%; hlLF 43.5% hllf 87%; HLlf 13% Question 7 In tomato plants the genes for hairless (hl) and leafy (lf) are located 18 cM apart on chromosome 5. What gametes and at what frequency would be produced by a self-pollinated plant heterozygous at both loci with the following configuration HLLF//hllf? HLLF 9%; hllf 9%; HLlf 41%; hlLF 41% HLLF 41%; hllf 41%; HLlf 9%; hlLF 9% HLLF 50%; hllf 50% HLLF 18%; hllf 18%; HLlf 41%; hlLF 41% HLLF 41%; hllf 41%; HLhl 9%; lfLF 9% HLLF 82%; hllf 82%; HLlf 9%; hlLF 9% Math 1 Question 8 In mice short tails (T) are dominant over long and a solid (S) coat is dominant over a spotted coat. These two genes T and S are located on the same chromosome, 5 map units apart. One particular mouse has a short tail and a solid coat with the following genotype Ts//tS. What proportion (%) of this mouse’s gametes will be Ts? (One decimal place) Your Answer: Question 9 (47.5) Math 2 In mice short tails (T) are dominant over long and a solid (S) coat is dominant over a spotted coat. These two genes T and S are located on the same chromosome, 9 map units apart. If a short tail, solid coat mouse (Ts//tS) is crossed with a long tailed, spotted coat mouse (ts//ts) what percentage of the F1 progeny would be long tailed, solid coat? (One decimal place) Your Answer: (45.5) Question 10 In a rare variety of orchid two genes responsible for petal colouring show linked assortment. Pink flowers (P) are dominant over green and the presence of black spots (S) is dominant over no spots. After a dihybrid cross (PS//ps X PS//ps) you record the phenotypes of the F1 progeny in order to map these genes. Based on the following observations calculate the distance between these two genes in map units; one decimal place. Pink, Spotted: 314 Pink, no spots: 19 Green, Spotted: 9 Green,no spots: 105 Your Answer: (6.3)