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- С. Each individual (plant) produces one kind of gamete d. All of the progeny are genetically like the female e. None of these In humans, what is characteristic of the y chromosome? a. Submetacentric centromere b. No satellites C. Arm fluoresces with fluorescent banding techniques d. A and b е. В and c If 25% of a queen bee's eggs are fertilized, what would be the sex ratio of the progeny? 100% female a. b. 75% female, 25% male С. 50% female, 50% male d. 25% female, 75% male e. Cannot be determined from the information. Which of the following statements is true? In liverworts, the sporophyte generation is haploid. b. Autosomal chromosomes are morphologically different between the male and female a. sex. C. Drosophila and humans have the same type of chromosomal make up between the male and female sex. d. In Drosophila, the genes for maleness are carried on the x chromosome. e. In Drosophila, the y chromosome governs sex determination. Ten cocker spaniel puppies are born. What is the…1. Ten centromeres are observed in a prophase cell from a Sorghum bicolor plant. a. How many pairs of chromosomes does this plant contain? b. For each stage of mitosis, indicate the number of centromeres you would expect to find and the number of copies of chromosomes attached to each centromere. Stage of mitosis: Number of centromeres visible cell Number of chromosomes per copies attached to centromere Prophase Anaphase4. (a) Please fill out the following table to describe the classic floral phenotypes of A, B, and C class homeotic mutants. The organ identities of the four whorls in a wild type Arabidopsis flower are filled out for you. Please fill out the rest of the table to indicate the organ identities in different whorls of the mutant flowers. ( Whorl 1 Whorl 2 Whorl 3 Whorl 4 Wild type sepals petals stamens carpels A class gene mutants B class gene mutants C class gene mutants
- You are a developmental geneticist studying flowering time variation in Arabidopsis. You perform a mutagenesis screen to identify mutants in the photoperiod pathway. You conduct the screen and find two different plants that show the same mutant phenotype. You then use a complementation test. What is the predicted outcome of this test if both phenotypes are caused by mutations in separate genes? recover the wild type phenotype overexpress the gene O recover the mutant phenotype41. In the early 199Os, Carolyn Napoli and her colleagues were working on petunias, attempting to genetically engineer a variety with dark purple petals by introducing numerous copies of a gene that codes for purple petals (C. Napoli, C. Lemieux, and R. Jorgensen. 1990. Plant Cell 2:279-289). Their thinking was that extra copies of the gene would cause more purple pigment to be produced and would result in a petunia with an even darker hue of purple. However, much to their surprise, many of the plants carrying extra copies of the purple gene were completely white or had only patches of color. Molecular analysis revealed that the level of the MRNA produced by the purple gene was reduced 50-fold in the engineered plants compared with levels of MRNA in wild-type plants. Somehow, the introduction of extra copies of the purple gene silenced both the introduced copies and the plant's own purple genes. Provide a possible explanation for how the introduction of numerous copies of the purple…This diagram shows a parental cell going through mitosis and producing 2 daughter cells. Which cells in th- mutation.) D |G H) D and G are genetically identical, but H is genetically different. O D and H are genetically identical, but G is genetically different. O Gand H are genetically identical, but D is genetically different. O All of the cells - D, G, and H - are genetically identical. O None of the cells in the diagram are genetically identical. All the cells - D, G, and H- are genetically different from each otl
- A diploid plant cell contains 54 chromosomes (2n=54). Describe the number arrangements of chromosomes in each of the following: a.A leaf cell immediately following cytokinesis b.A gametophyte cell at the conclusion of the S phase of mitosis1. Which changes in chromosome structure cause a change in the total amount of genetic material, and which do not? 2. How does a chromosomal duplication occur? 3. An inversion heterozygote has the following inverted chromosome: B What would be the products if a crossover occurred between the genes F and E on the inverted chromosome and the normal chromosome? 4. An individual has the following reciprocal translocation: с D Centromere A B JI HGF ED CKLM Inverted region с D What would be the outcome of alternate segregation, adjacent -1 segregation and adjacent-2 segregation? 5. Two phenotypically unaffected parents produce two children with familial Down syndrome. Regarding chromosome 14 and 21, what are the chromosomal composition of the parents? 6. Explain how aneuploidy, deletions and duplications cause genetic imbalances. 7. Why do you think that deletions and monosomies are more detrimental than duplications and trisomies? 8. Describe some of the advantages of polyploid plants. 9.…In Corn, Male sterility is controlled by maternal cytoplasmic elements. This phenotype renders the male part of corn plants(i.e. the tassol) unable to produce fertile pollen; the female parts. However, remain receptive to pollination by pollen from male fertile corn plants, however the presence of a nuclear fertility restore gene F restores fertility to make sterile lines. b. Explain the phenotype of the offspring.
- You are a developmental geneticist studying flowering time variation in Arabidopsis. You perform a mutagenesis screen to identify mutants in the photoperiod pathway. Given what you know about photoperiodism in Arabidopsis, what phenotype are you looking for and under what photoperiodic conditions would you perform the experiment? delayed flowering in long days delayed flowering in short days same flowering in short days early flowering in short days same flowering in long days early flowering in long daysIn roses, the synthesis of red pigment is by two steps ina pathway, as follows:colorless intermediate gene Pmagenta intermediate red pigment gene Qa. What would the phenotype be of a plant homozygousfor a null mutation of gene P?b. What would the phenotype be of a plant homozygousfor a null mutation of gene Q?c. What would the phenotype be of a plant homozygousfor null mutations of genes P and Q?d. Write the genotypes of the three strains in parts a, b,and c.e. What F2 ratio is expected from crossing plants fromparts a and b? (Assume independent assortment.)Provide the following information 1. One intrinsic factor that causes mutation. 2. Type of mutation that runs in the family. 3. Euploidy type in humans. 4. Advantage of tetraploid plants over triploid. 5. Aneuploidy is usually caused by what cell cycle event?