This section provides a quick preview of questions from the document. It may not display every question or the complete wording of each one. For the full content, including diagrams, tables and other information, view the original PDF above.
Q1— Section header —
1.1Various options are given as possible answers to the following questions. Choose the correct an swer and write only the letter (A to D\ next to the question number (1.1.1 to 1.1.10\ in the ANSWER BOOK, for example
1.1radual change in the structure of organisms over time is known as evolution. mutation. pro tein synthesis. natural selection.
1.1he following are statements relating to evolution (i\ (ii\ (iii\ (iv\ Artificial s
1.1Which ONE of the following is the result artificial selection? DDT resistance in mosquitoes Decreasing effect of antibiotics on bacteria
1.1Which of the following represents ONE advantage and ONE disadvantage of genetic engineering in developing desirable products? dvantage isadvantage
1.1The diagram below shows the fertility of the offspring produced when three populations of mice, , interbreed. Which ONE of the followin g statements about populations
1.1In humans the allele for blood group A is dom inant to the allele for blood group O. Two parents both have blood group A. Their child has blood group O. What is the best explanation this pattern of inheritance?
1.1In a investigation it was found that 10% of the bases in a molecule of DNA were thymine hat wa s the ratio of thymine to guanine in
1.1After observing a cer tain phenomenon a s cientist can formulate a/an ... theory. hypothesis. fact. law.
1.1Genes in organisms can be manipulated by human beings in order to produce useful substances. One example of a useful substance produced in this way is the human protein insulin, which is used to treat diabetes.
1.1.10The gra ph below shows the changes in the h eight of horses over evolutionary time. Adapted from Biology , Jones and Jones 1993
1.4In humans, the allele for brown eye colour (B\ is dominant over the allele for blue eye colour (b\. A scientist collected information about the inheritance of eye colour in a certain family. e information obtained is
1.4.1and 1.4.2 refer to the following possible answers (i, ii, iii, iv\ . Write only the number i, ii, iii iv\ next to the uestion number
1.4.2They have the same phenotype and the same genotype They differ in phenotype but have the same genotype. They have the same phenotype but differ in genotype. They differ in both phenotype and genoty
1.4.3If person is homozygous for the dominant eye colour allele, then which of the above statements is TRUE about person person Which of the statements above is
Q2— Section header —
2.1Study the diagram below which shows a stage in protein synthesis
2.1.3Name the stage in protein synthesis represented by the diagram above rite down the D NA base triplets that correspond the
2.1.4The table below shows the amino acids coded for by various tRNA anticodons Anticodons o n tRNA Amino acid coded for Proline GAA Glutamate Glycine
2.2Cystic fibrosi s is a genetic disorder characterised by abnormal production of mucus in the lungs of humans. It is caused by a mutation in a gene on chromosome 7 that codes for the protein CFTR. The protein CFTR is made
2.2.3How do we know that the base triplets represented are thos of DNA Name the type of gene mutation represented by the information in the
Q2— Section header —
2.3.3Use the symbols to represent genetic cross of the mating stated above. Also indicate the proportion of the phenotypes. Explain why
2.3The i nheritance o fur colour in cats is sex linked. The tort oise shell colour of cats a combination of black and orange fur.
2.4The diagram represents a cell at metaphase of meiosis I. Draw fully labelled diagram represent ONE of the resulting cells at the same phase of
Q3— Section header —
3.1Many species of cichlid fish are found in Lake Malawi in Africa. All these species have evolved from a single ancestral specie s. The diagram s below show the mouths of three different cichlid fish species
3.1.2tate ONE advantage of he three c ichlid species being speciali feeder s, eating different types of food
3.2Tabulate TWO stru ctural features of the skull that would distinguish the a ustralopithecines from Homo sapiens (5\ (12\ 3 million 2 million 1 million present
3.3.1For the investigation above identify: (a\ (b\ The dependent variable THREE factors that should have been kept constant during the investigation
3.3.4hy did the scientist use more than one petri dish in each group? What wa
Q4— Section header —
4.1The table below shows the birth weight and the number of babies that survive at the different weights. Birth w eight (kg\ Number of babies rviving
4.1.3Draw a histogram using the i nformation in the table above. Name the type of inheritance that is controlled by many genes such as in birth weight
Q4— Section header —
4.2Read the extract below and answer the questions that follow. DNA TESTING OF MEAT Research by Stellenbosch University scientists found traces of donkey, water buffalo and goat meat in beef mince samples taken from acr
4.2.6Explain h ow t was possible for scientist to identif the different species in the meat samples tested. Give