Question: In a plant the gene e+ codes for a certain enzyme. The gene r+ codes for a regulatory protein that binds to the regulatory region of gene e+ in order for transcription to occur. A recessive mutation is obtained in each of the genes, r and e, respectively. A dihybrid […]

1. How does mitosis differ from meiosis? When do they occur in the body and what is their purpose? 2. Name and briefly describe 4 different chromosome abnormalities that can occur. (Use actual conditions and describe how they affect the carriers). 3. A child is born with attached ear lobes. […]

Q1. A patient who inherited two defective copies of a gene essential by white blood cells, suffered from a severe immune deficiency disease. The patient recovered from a disease following gene therapy, in that he received an expressed copy of the ‘missing’ gene (the desired outcome). Unfortunately, he afterwards developed […]

1. What mechanism of allopatric speciation (dispersal or vicariance) is primarily acting on these studied populations of Centaurea? Justify your answer.  2. How did the authors measure the degree of reproductive isolation among the three species examined?   Examine figure 1, and answer the following three questions: 3. What is the relevance of […]