What is the general gene regulation mechanism that "cassette exons" and "intron retention" are involved with? Explain their differences in regards to which kinds of organism use each and how each is different in what they do
What will be an ideal response?
They are different types of alternative splicing. Cassette exons is a method used mainly by animals, and intron retention is used mainly by plants, fungi, and protozoa. Cassette exons achieves alternative splicing by excluding one or more exons from the mature mRNA. Intron retention achieves alternative splicing by including introns into the mature mRNA (this can lead to novel functions or no function in the mature protein).
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Biomagnification is a significant problem in aquatic communities. Levels of chemicals magnify (increase or accumulate) at each new link in a food chain. Use the following information to estimate the level of chemical X in a large-mouth bass. One alga can accumulate 1 unit of chemical X. Eachcopepod eats 15 algae. A minnow consumes 10 copepods, each large-mouth bass consumes 20 minnows.
A. 15 units B. 20 units C. 30 units D. 150 units E. 300 units F. 3,000 units G. 20,000 units Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about biomagnification? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
A paleontologist has recovered a bit of tissue from the 400-year-old preserved skin of an extinct dodo (a bird). To compare a specific region of the DNA from the sample with DNA from living birds, which of the following would be most useful for increasing
the amount of dodo DNA available for testing? A) RFLP analysis B) polymerase chain reaction (PCR) C) electroporation D) gel electrophoresis E) Southern blotting
A testcross consists of a cross
a. of two pure-breeding forms to find out which form of a gene is dominant. b. between two unknown forms to determine their genotypes. c. between an offspring and its homozygous dominant parent. d. of an organism of dominant phenotype but unknown genotype to an individual that is homozygous recessive for that trait. e. of two F2 individuals to produce an F3 generation.
Inheritance patterns cannot always be explained by Mendel's models of inheritance
If a pair of homologous chromosomes fails to separate during meiosis I, select the choice that shows the chromosome number of the four resulting gametes with respect to the normal haploid number (n)? A) n+1; n+1; n-1; n-1 B) n+1; n-1; n; n C) n+1; n-1; n-1; n-1 D) n+1; n+1; n; n