Genetics

3.1.2 Types of Cell Division   1. There are two types of cell division processes in the human cell namely, mitosis and meiosis.2. Mitosis is a cell division to produce two identical daughter cells which are genetically similar and have the same number of chromosomes to the parent cell.   3. Mitosis is carried out (a) in somatic … Read more

3.1 Cell Division 3.1.1 Genes, Deoxyribonucleic Acids (DNA) and Chromosomes 1. The nucleus of a cell contains many small thread-like structures called chromosomes.   2. Chromosomes always exist in pairs (except in gametes).   3. Each chromosome contains a molecule of a deoxyribonucleic acid (DNA).   4. On each chromosome, there are genes which are the basic hereditary units. … Read more

Question 1:Diagram 1 shows the schematic diagram of sex determination in human being.(a) In Diagram 1, complete the sex chromosomes in gametes K and L. [2 marks](b) What is gamete L? [1 mark](c) State process B. [1 mark](d) State the sex of offspring M. [1 mark](e) Based on Diagram 1, state the percentage to get … Read more

Question 1:Diagram 1 shows the stages of cell division.(a)(i) Name the type of cell division as shown in Diagram 1. [1 mark]  (ii) Give reason to your answer in (a)(i). [1 mark](b) Arrange the stages of cell division P, Q, R and S in a correct sequence in the boxes given. [1 mark](c)(i) Name structure … Read more

Question 1:What is mutation? Answer:Mutation is a change that occurs spontaneously and randomly on the genes or chromosomes, which can cause a characteristic change in the child inheriting the modified genetic materials. Question 2:List three factors that cause mutation. Answer:Radioactive radiation, X-ray and toxic chemical substances. Question 3:List the advantages and disadvantages of genetic research. … Read more