number as when they fuse during fertilization the full chromosome number (diploid) will be restored. Questions 1. The diagram shows three types of cells in a life history of a simple animal. (a) How do the chromosomes of the body cells compare with the chromosomes in the fertilised egg from which they came? (1) (b) Describe what happens to chromosomes in the nucleus of a body cell when it forms reproductive cells. (4) 2. The diagram shows two stages (A and B) in meiosis in an organism containing one pair of chromosomes. One gene pair is shown. (a) Describe what happens during stage A that results in stage B. (1) (b) Which two of the following cells, P, Q, R, S, T, are gametes? (2) 3. Complete the table to show the differences between mitosis and meiosis. Mitosis Meiosis Number of cells produced Parent cell (diploid/ haploid) Daughter cell (diploid/ haploid) Lining up of chromosomes How many cell divisions Genetically identical or different
number as when they fuse during fertilization the full chromosome number (diploid) will be restored. Questions 1. The diagram shows three types of cells in a life history of a simple animal. (a) How do the chromosomes of the body cells compare with the chromosomes in the fertilised egg from which they came? (1) (b) Describe what happens to chromosomes in the nucleus of a body cell when it forms reproductive cells. (4) 2. The diagram shows two stages (A and B) in meiosis in an organism containing one pair of chromosomes. One gene pair is shown. (a) Describe what happens during stage A that results in stage B. (1) (b) Which two of the following cells, P, Q, R, S, T, are gametes? (2) 3. Complete the table to show the differences between mitosis and meiosis. Mitosis Meiosis Number of cells produced Parent cell (diploid/ haploid) Daughter cell (diploid/ haploid) Lining up of chromosomes How many cell divisions Genetically identical or different