LCC Lab Exam 2 with 100% Correct Answers 2024

LCC Lab Exam 2 with 100% Correct Answers 2024 How many chromosomes are in a human cell? How many pairs? - ️️ - 46, 23 pairs What characteristics do homologous chromosomes have? (what makes them a pair? - ️️ - Same size, same banding pattern, matched gene for gene What kind of antigens are present in the blood of a person that is type A? What antibodies are present? - ️️ - A-antigens, anti-B antibodies What kind of antigens are present in the blood of a person that is type AB? What antibodies are present? - ️️ - both A and B antigens, no antibodies What kind of antigens are present in the blood of a person that is type O? What antibodies are present? - ️️ - No antigens , both anti-A and anti-B antibodies Which kind of blood cells fight off infection? - ️️ - leukocytes (white blood cells) What is the end result of nondisjunction? When does it occur? - ️️ - unequal distribution of chromosomes, it can occur either during meiosis I or II What does aneuploidy mean? - ️️ - abnormal number of chromosomes in a cell How does a cell's surface area to volume ratio affect the efficiency of the cell? - ️️ - Cell is most efficient with a larger SA:V ratio. As the surface area decreases and volume increases, the cell is likely to die as diffusion is incapable of penetrating entire volume or meeting metabolic requirements Why don't single celled organisms grow larger to be like the size of an apple or hamster? - ️️ - A large cells has a very small SA:V ratio, materials unable to diffuse in and out of cells at a rate that would sustain life List 2-3 sources of genetic variation within