Question

a student listed some characteristics of mitotic cell division.

1. it is involved in random distribution of paternal and maternal chromosomes into daughter cells.
2. it is a method of reproduction in unicellular organisms.
3. it is a mechanism for replacing old or worn - out cells.
4. it produces daughter cells with the same numbers of chromosomes as the parental cells.
5. it introduces new combinations of genes in cells.

which features are listed incorrectly?
options:
0, 4, and 5
1 and 5
1 and 4
2, 3, and 4

Explanation:

• Feature 1: Mitosis involves the random distribution of chromosomes into daughter cells. This is incorrect. In mitosis, the daughter cells receive an identical set of chromosomes as the parent cell.
• Feature 2: Mitosis is a method of reproduction in unicellular organisms. This is correct. Unicellular organisms like amoeba reproduce asexually by mitosis.
• Feature 3: Mitosis is a mechanism for replacing old or worn - out cells. This is correct. For example, skin cells are constantly replaced by mitosis.
• Feature 4: Mitosis produces daughter cells with the same number of chromosomes as the parental cells. This is correct. Mitosis is a equational division, maintaining the chromosome number.
• Feature 5: Mitosis introduces new combinations of genes in cells. This is incorrect. Mitosis produces genetically identical cells. Genetic recombination occurs in meiosis.

Answer:

C. 1 and 5