People with two copies of the sickle cell gene have the disease. People who carry only one copy of the sickle cell gene do not have the disease, but may pass the gene on to their children. Abnormal hemoglobin, called hemoglobin S, causes sickle cell disease (SCD). The problem in hemoglobin S is caused by a small defect in the gene that directs the production of the beta globin part of hemoglobin. This small defect in the beta globin gene causes a problem in the beta globin part of hemoglobin, changing the way that hemoglobin works.
There is two answers to that because there are two different forms of cells that being animal and plant cells. The cell is surrounded by a cell or plasma membrane. Unlike the animal cell the plant cell also has a cell wall surrounding it. This is made of cellulose and is very rigid.
When meiotic cell division occurs, a diploid parent cell experiences cell division to produce four haploid cells. Thus, if three parent cells undertake meiosis, <u>twelve haploid cells</u> will be created.
I think the correct answers from the choices listed above are options D and E. You should not use context clues when you feel unsure of your guess and the surrounding words are also unfamiliar. Hope this answers the question.
