IGCSE Biology Paper-3: Specimen Questions with Answers 280 - 280 of 358

Passage

Reproduction is a characteristic of all living organisms.

Question 280 (4 of 4 Based on Passage)

Write in Short

Short Answer▾

Fig. shows some examples of reproduction.

Single Celled Organism

State the letter or letters that identify examples of asexual reproduction.

Give a reason for your answer using evidence from Fig.

letter (s) …

reason …

Explanation

A & C

Bacteria reproduce by binary fission. In this process the bacterium, which is a single cell, divides into two identical daughter cells. Binary fission begins when the DNA of the bacterium divides into two (replicates) . The bacterial cell then elongates and splits into two daughter cells each with identical DNA to the parent cell. Each daughter cell is a clone of the parent cell.

Amoeba reproduces by the common asexual reproduction method called binary fission. After replicating its genetic material through mitotic division, the cell divides into two equal sized daughter cells. The genetic material is also equally partitioned; therefore, the daughter cells are genetically identical to each other and the parent cell. In this process, the nucleus of the Amoeba first divides to form two daughter nuclei by the process of Karyokinesis. After the nucleus has divided into two, the process of Cytokinesis takes place in which the cytoplasm in the mother cell divides into two daughter cells.

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