The diagram shows part of a pre-mRNA molecule. A G part X (a) (i) Name the two substances that make up part X. (ii) Give the sequence of bases on the DNA strand from which this pre-mRNA has been transcribed. (b) (i) Give one way in which the structure of an MRNA molecule is different from the structure of a tRNA molecule. (ii) Explain the difference between pre-mRNA and mRNA. (c) The table shows the percentage of different bases in two pre-mRNA molecules. The molecules were transcribed from the DNA in different parts of a chromosome. Part of Percentage of base chromosome A G U Middle 38 20 24 End 31 22 26
Gene Interactions
When the expression of a single trait is influenced by two or more different non-allelic genes, it is termed as genetic interaction. According to Mendel's law of inheritance, each gene functions in its own way and does not depend on the function of another gene, i.e., a single gene controls each of seven characteristics considered, but the complex contribution of many different genes determine many traits of an organism.
Gene Expression
Gene expression is a process by which the instructions present in deoxyribonucleic acid (DNA) are converted into useful molecules such as proteins, and functional messenger ribonucleic (mRNA) molecules in the case of non-protein-coding genes.
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