UCI BIO 93 Final Prep Test Questions With Answers

UCI BIO 93 Final Prep Test Questions With Answers What is an example of incomplete dominance? - ANSWER A red and white snapdragon making a pink offspring What is an example of co-dominance? - ANSWER Blood cells. What is Pleiotropy? - ANSWER When a gene affects more than one phenotypic character. What is the norm of reaction? - ANSWER The range of phenotypic possibilities What are some example of polygenic inheritance? - ANSWER Skin color and height Norms of reactions are broadest for _____________ characters - ANSWER polygenic Genetic traits in humans can be tracked through what? - ANSWER Family pedigrees What is loosely packed chromatin called? - ANSWER Euchromatin What happens in histone acetylation? - ANSWER Acetyl groups are attached to histone tails What is the purpose of histone acetylation? - ANSWER To loosen chromatin structure to promote initiation in transcription. In what gender is Igf2 expressed in? - ANSWER The maternal chromosome What does it mean for a protein to be ubiquitinated? - ANSWER Ubiquitin attached to the protein and takes it to a proteasome that degrades the protein. What does a repressor do? - ANSWER Block transcription of a gene What does an activator do? - ANSWER Stimulate the transcription of a gene What binds to the enhancers? - ANSWER The activators What are some ways that mRNA can be degraded? - ANSWER shortening of poly A tail, removal of cap, nucleases chew up mRNA What are histones responsible for? - ANSWER 1st level of DNA packing in chromatin What is a region of highly condensed chromatin called? - ANSWER Heterochromatin