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1.1Various options are provided as possible answers to the following questions. Choose the answer and write only the letter (A to D\ next to the question numbers (1.1.1 to 1.1.10\the ANSWER BOOK, e.g. 1.1.11
1.1Which ONE of the follo wing is a reproductive isolation mechanism? Breeding at the same time of the year
1.1The scientists who won the Nobel Prize for the discovery of the structure of DNA were
1.1In a dihybrid cross, a n animal with long ears \and red
1.1Which ONE of the following reduces genetic variation in the offspring?
1.1.5Meiosis is best explained as a process that produce daughter cells. two haploid
1.1Colour blindness is a disorder caused by recessive allele on the
1.1.7The s tudy of the inheritance of mutation in m itochondrial DNA is an example of
1.2.9The bonds that hold the two strands of a DNA molecule together A genetic cross involving one gene and its alleles Undifferentiated cells that may form any other cell in the human body The structure
1.3Indicate whether each of the descriptions in COLUMN I apply to A ONLY B ONLY BOTH A AND B or
1.3.1Found in the nucleus A: B: DNA RNA
1.3.2Random arrangement of chromosomes A: B: Anaphase II Metaphase I
1.3.3Site of meiosis in humans A: B: Testis Somatic cells (3 x 2\ (6\
1.4The diagram below represents a pair of homologous chromosomes in a plant cell. The alleles for two characteristics, seed colour ( and \d plant height and
1.4.1Give the term used to describe the positi on of an allele on a chromosome. (1\
1.4.2Identify parts and (2\
1.4.3Name the process during which parts and exchange genetic material. (1\
1.4.4During which phase of meiosis does the process named in
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1.4.5State the following for this plant: (a\ (b\ Genotype The characteristic that is homozygous recessive (2\ (1\ (8\
1.5The diagram below represents some nucleotides in a single strand of DNA.
1.5.1Give the LETTER of the part that represents a (a\ (b\ ugar molecule
1.5How many nucleotides are represented in the diagram? Write down the nitrogenous bases (from top to bottom as indicated by the arrow \ the complementary DNA strand of this molecule. Name TWO processes that require the two strands of a
1.6The table below shows the blood groups of the members of a family. Two of the children are biological offspring of the parents and one child is adopted. FAMILY
1.6.1How many (a\ (b\ Different phenotypes for blood group appear in this family Possible genotypes are there for blood group
1.6.2Give the genotype of the father (2
1.6.3Which member of the family: (a\ (b\ (c\ Has the genotype ii Has co dominant alleles Is adopted
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2.1Haemoglobin is a protein found in blood that carries oxygen to all the cells of the body . A porti on of this protein is called a b eta chain If the sequence of
2.1Give the (a\ (b\ DNA base triplet
2.1What is a change in the sequence of DNA base triplets called? Use the in formation in the tables to explain how a cha
2.2Describe the process of translation during protein synthesis. (6\
2.3The karyotype below represents the chromosomes of a person.
2.3.5Give the collective term for the chromosomes numbered 1 to 22. State the gender of this person.
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2.4In rabbits fur colour may b e black, white or grey . The inhe ritance of fur colour
2.4.2Explain why fur colour in rabbits is an example of inheritance with inc omplete dominance
2.5In humans, the ability to taste a certain substance is inherited and is controlled by the dominant allele People who are able to taste th
2.5.2What does the term dominant allele mean? Give the: (2\ (a\ (b\
2.5Use evidence from the diagram to support your answer to
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3.1here are anatomical differences between African apes and humans There are also characteristics that they share. 3.
3.1.3Name ONE characteristic of the hand that African apes share with humans. Tabulate HREE differences between the sk ulls of
3.2The fat content of cow milk may vary between 2,6% and 5%. A farmer has found that there is a high demand for low fat milk (milk with a fat content of 3% or less\
3.2.4Draw a histogram to represent the results of the survey Calculate the percentage of the farmer cows that produce low
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3.3.1
3.3.2 Identify the type of diagram shown above Na me the TWO species that share the most recent common ancestor.
3.3.3 Use information in the diagram to describe how biogeography supports the theory of evolution. 4\
3.3.4 Describe how it can be proven that ostriches and rheas are different species.
3.4There is variat ion in tawny owls. Some are white and others are brown in colour. Scientists studied these owls over a period of 30 years from 1980 to 2010 to
3.4.1dentify the dependent variable in this investigation. (1\
3.4.2What conclusion can be made about the suitability of each colour owl to survive in more snow (2
3.4Explain the results obtained from 2000 to 2010 for the white owls
3.4.4Describe how the scientists determined the number of owls that survived each year (3\
3.4Name ONE variable that w as kept the same.
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