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1) A mutation that changes an alanine residue in the interior of a protein to valine is found to lead a loss of activity. However, activity is regained when a second mutation at different position changes an isoleucine residue to glycine. How might this second mutation lead to restoration of […]

Question: Prokaryotes increase in number by asexual reproduction, brings in variation in the population through conjugation, transduction and transformation. They are extremely diverse and well adapted. Why then do you think eukaryotic cells arise?   Question: Starting with a protocell, what would you consider to be the most important significant evolutionary events […]

Assume you ask is to work with the genetic code and examine the structure and characteristics of the amino acids used to make proteins and answer the following question. Hint: Think about how the different amino acids contribute to protein structure. You don’t need to discuss the role of amino […]

X-linked recessive inheritance: In cats, one gene for coat color is X-linked. Male cats are either black, XBY, or orange, XbY depending on which allele they carry. Females are black (XBXB), orange (XbXb) or tortoise-shell (XBXb) (mosaic patches of black and orange), with the tortoise-shell phenotype resulting from the heterozygous […]