Answer:
I am assuming that the mutant cells have mutated beta galactosidase activity hence the relative levels of enzymatic activity would be reduced.
Rickets is the disease in children in which an inefficient mineralization of the bone forming tissue causes deformities. This condition results in weak or soft bones in children, normally due to an extreme and prolonged deficiency of vitamin D. Vitamin D promotes the absorption of calcium and phosphorus from the gastrointestinal tract. The symptoms include bowed legs, stunted growth, bone pain, large forehead, and trouble sleeping among others.
Answer:
Everything at some point belonged to a common ancestor, but these four species are considered to be like this because of similar ancestral traits that have been passed on to generations such a homologous pairs, vestigial structures, they are all mammals, similar amino acid sequences, vertebraes, etc.
A the cell, definition - the cytoplasmic division of a cell at the end of mitosis or meiosis, bringing about the separation into two daughter cells.
