Question

1.A recent research paper demonstrated that cAMP bound to CAP acts more strongly on the lac operon than on the arabinose operon. Given what you know about catabolite regulation, and the lac operon, list the order of preference of utilisation of the three sugars; arabinose, lactose and glucose.

2.A 3000 bp region of the human genome encodes two genes. One of the genes encodes a protein of 700 amino acids and the other gene encodes a protein of 310 amino acids. The mRNA sequences of the two genes do not contain any of the same nucleotide sequences. How is this possible? Fully explain your answer.

3.Even in the absence of genetic recombination, meiosis is an important source of genetic variation in sexually reproducing organisms. Use as an example a species with 2n=8, and an individual of that species that is a quadruple heterozygote for loci A, B, C, and D, with each loci on a different chromosome. Determine how many different types of gametes this individual can produce, and explain how segregation and independent assortment mechanisms produce genetic variation in the gametes produced by this individual. Use the following terms in your response: genes; alleles; homologous chromosomes; non-homologous chromosomes.

Answer 1