Genetics Exam #2 With Questions and Answers 100% Solved

Genetics Exam #2 With Questions and Answers 100% Solved What is the molecular mechanism for imprinting a gene? a. acetylation b. methylation c. phosphorylation d. mutation e. nitration - answerB Genomic imprinting most commonly uses____ to ____genes. Select one: a. acetylation : activate b. methylation : activate c. phosphorylation : activate d. methylation : deactivate e. phosphorylation : deactivate - answerD Individuals with three copies of most autosomes do not survive. Individuals with an extra X chromosome, however, survive with relatively mild (compared to autosomal abnormalities) consequences. Why? Select one: a. Because the X chromosome determines sex only. b. Because the X chromosome contains few genes while autosomes contain a large number. c. Because the extra X chromosome(s) are inactivated. d. None of the answers are correct. e. All of the answers are correct. - answerC The majority of calico cats are female. However, a few rare males are observed. What is the genotype of a male calico cat? Select one: a. XbYY b. XBXb c. XBXbY d. XBY e. XBXBY - answerC Why is X-inactivation needed in humans? Select one: a. for dosage compensation b. to eliminate X-linked lethal alleles c. all the answers are correct d. to inactivate genes coming from one parent e. to protect against heterosis - answerA Monoallelic expression is usually associated with ____________ in diploid organisms. Select one: a. dominant epistasis b. dosage compensation c. genomic imprinting d. maternal effect e. extranuclear inheritance - answerC Where is extra nuclear DNA located in mam