Summative Practice Chapter 6 – Question 5, 6, 7 & 8 (Form 4 Biology Textbook Exercise and Answer)

Question 5:Figure 1 shows a cell at stage M in a cell cycle. Draw both cells that will be formed if the P chromosome does not separate. Answer: Question 6:Figure 2 shows the complete set of chromosomes of an individual.Figure 2(a) State the genetic disorder this individual has.(b) Explain how this individual is born with … Read more

Summative Practice Chapter 6 – Question 1, 2, 3 & 4 (Form 4 Biology Textbook Exercise and Answer)

Question 1:Name the sequences in the mitosis process. Answer:Prophase, metaphase, anaphase, telophase Question 2:What is the function of the centriole in the division of animal cells? Answer:To form spindle fibres Question 3:State one difference between mitosis metaphase and meiosis metaphase I. Answer:• At the mitotic metaphase stage, chromosomes are arranged on the equatorial plane whereas … Read more

Formative Practice 6.4 (Form 4 Biology Textbook Exercise and Answer)

Question 1:Explain why radiotherapy is used to control or stop the growth of cancer cells. Answer:Radiotherapy (RT) is a method used to treat cancer. This method uses high-powered ionising radiation to kill cancer cells. A high dose administration is administered to the target (tumor) to heal, control or reduce symptoms of the patient. However, adjacent … Read more

Formative Practice 6.3 (Form 4 Biology Textbook Exercise and Answer)

Question 1:State the most obvious difference between meiosis I and meiosis II. Answer:The most obvious difference between meiosis I and meiosis II is the decrease in number of chromosomes in the cell. Question 2:Explain how meiosis I can reduce the number of chromosomes in the daughter cell. Answer:Meiosis I reduces the number of chromosomes in … Read more

Formative Practice 6.2 (Form 4 Biology Textbook Exercise and Answer)

Question 1:State the application of mitosis in the field of agriculture. Answer:Mitosis is used in plant tissue culture to produce plantlets from a parent cell. Question 2:Explain the process that occurs during the S phase. Answer:In phase S, DNA content will double, that is, DNA replication. Question 3:Predict what will happen if the spindle fibres … Read more

Formative Practice 6.1 (Form 4 Biology Textbook Exercise and Answer)

Question 1:Give the definition of the following terms:(a) karyokinesis (b) cytokinesis (c) chromatin(d) homologous chromosomes Answer:(a) Karyokinesis is a stage in cell division that involves the division of nucleus.(b)Cytokinesis is the cytoplasm division stage.(c) Chromatin is double-stranded DNA that is coiled around histone proteins.(d) Homologous chromosomes is a pair of chromosomes from the same set of chromosomes, … Read more