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Choose which of the following is true:
a) Haploid cells have one allele per gene
b) Haploid cells have two alleles per gene
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- In the lab, you discover two yeast haploid mutants that cannot produce arginine. You cross them together and the resulting diploid produces arginine. If producing arginine is the wild type phenotype, what can you definitively conclude? A.The haploid strains have identical mutations in the same genes. B.The haploid strains have identical mutations in different genes. C.The haploid strains have mutations in different genes. D.The haploid strains have mutations in the same gene. E.The haploid strains must belong to the complementation group encoding the first enzyme in the biosynthetic pathway.Based on your knowledge of genetics, how would you determine whether kanamycin or BASTA-resistant T2 seedlings are homo- or hemizygous for Bar or NPTII?At the molecular level (with regard to loss-of-function alleles), explain why the ttvv homozygote has an ovate seed capsule.
- Show an example of Robertsonian Translocation using lettersConsult Figure 1, which shows a human karyotype with chromosomes arranged in order of decreasing size. Would you expect this cell to have any genes characterized as hemizygous? If so, what is an example of a hemizygous gene? On which chromosome would it be located?A heterozygous diploid yeast Aa Bb went through meiosis. What percentage of the haploid spores will have recombinant combinations of alleles? What if genes A and B are unlinked? Explain What is genes A and B are linked? Explain
- Can single-celled organisms have multiple simultaneous phenotypes? If so, can you propose an example? If not, why?If each gene is located on a specific chromosome and that chromosome has two pairs (homologous chromosomes), how does each chromosome represent one allele and why do you label each chromatid with the same allele?In the following diagram, designate each daughter cell as diploid (2n) or haploid (n).
- For an organism with haploid number of 15, fill in the following table:Renner carried out reciprocal crosses between two types of the evening primrose, Oenothera hookeri and O. muricata, known to have the same chromosome constitution. When the seed parent was O. hookeri, the plastids of the progeny were yellow; but when the seed parent was O. muricata, the plastids of the progeny were green. How might this difference in the results of reciprocal crosses be explained?A genetic cross was made between two types of pea plants. One type produces round and green seeds, while the other type produces wrinkled and yellow seeds. A plant breeder crossed these two types and then allowed the F1 generation to self-fertilize. The following data were obtained: F1 generation: all produce wrinkled and yellow seeds. F2 generation: 157 produce wrinkled and yellow seeds 57 produce wrinkled and green seeds 54 produce round and yellow seeds 20 produce round and green seeds a) Propose a hypothesis that you think is consistent with the observed data. b) Test the goodness of fit between the data and your hypothesis using a chi square test. c) Explain what your calculated chi square results mean.