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1.1.7
1.1
1.1.1The process in which male gametes are formed in humans is oogenesis.
1.1.2When the first child of two parents, without any visible genetic disorder, was born, the child wa s found to have a serious genetic disorder. The parents were told t hat a recessive gene had caused the disorder, and that only one pair
1.1.3Below is a set of steps follo wing fertilisation in humans. Which is 1. The embryo is embedded in the uterine wall in humans. 2. A zygote is formed in 3. Cell division occurs to fo 4. The blastocyst remains free for several days in the uterus.
1.1.5What is the follicle called after day 14? Graafian follicle Secondary follicle
1.1.6A ring of DNA (plasmid\ ken from a bacterial cell to produce 1. The gene for insulin is remo ved from a cell of a human The bacteria make clones of themselves and produce The insulin gene is put into the plasmid and into a new
1.1.4Which hormones Ovarian hormone levels Growth of follicle B Hormonal regulation of the menstrual cycle BOOK.
1.2.7All the genes in all the chromosomes of a particular species can be used to determine whether people are related Structure in the sperm cell contai membrane of the ovum The period from fertilisation to birth
1.3.4
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1.2.1An arrangement of black bars r epresenting DNA fragments that ning enzymes that break down the The release of an ovum from a follicle A hormone produced in females to stimulate milk production
1.3Indicate whether each of the statements in COLUMN I applies to B only both A and B or of the items in COLUMN II. Write A only B only both A and B none
1.3.1Possible ways of improving of
1.3.2Forms the pl acenta A: Amnion
1.3.3Having a single set of A: Diploid A: Syphilis
1.3.5Technique used to determine B: Amniocentesis (5 x 2\ grow tubes. The fluid contains sugar. Zama wanted to investigate the following question: germinate/form pollen tubes in flowers?
1.4.3Explain why Zama used distilled wa ter in the first cavity slide. vestigation woul to get more reliable results. he above investigation. (2)2
1.4When a stigma is ripe, it secretes a fluid which stimulates pollen grains to How does the concentration of sugar affect the numbe r of pollen grains that She took 5 cavity slides. she filled with distilled water.
1.4.1State THREE ways in which this in d be improved Describe a conclusion for t cavity slide
1.5.4How many chromosomes are present in this karyotype? Is this karyotype that of a man or a woman?
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1.5The diagram below represents a karyotype of a human cell.
1.5.1Describe how the karyotype of a person with Down's syndrome will 1 2 sex-linked clotting and
1.6.1gender and haemophilia. (2)2
1.6Study the pedigree diagr am of a family where some individuals have haemophilia. Haemophilia is a disorder. Use for normal blood Key From the pedigree diagram above, st ate the relationship between
1.6.2Write down all the possibl e genotypes of individuals: Millicent Enid Priscilla Anele Normal female Normal male Henry Andrew SECTION B
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2.1.5Label structures and Which phase is represented by:
2.1Study the following diagr ams representing different phases of meiosis. (a\1 (b\2 Write down the numbers of the di agrams to show the correct Tabulate THREE differences between the first and second stages
2.2The diagrams below represent t he process of protein synthesis.
2.2.1Write down the sequence of the FIRST THREE nitrogenous bases lets of DNA and the amino acid each codes for. Base triplet of DNA Amino acid coded for CCG Glycine GTA Histidine CAA Valine
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3.1.3Label structures and State THREE functions of
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3.2.3State a hypothesis for t he investigation that sc ientists wanted to do. before the investigation above is undertaken on humans. In the investigation abov (3)3
3.2.4Explain ONE reason why some people might: (a) (b)
3.2Read the paragraph below and ans MALE CONTRACEPTIVE CHEMICAL Gossypol is a chemical which is extrac ted from the seeds of cotton plants. When gossypol was given to rats, mice, dogs and monkeys, it caused a
3.3Study the diagram of a flower below
3.3.3and Describe how the male gamete reac
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4.1cities in South Africa. Human blood groups axes.
4.2The table below shows the percent age frequency of human bl ood groups in the populations of two different % frequency in population City 1 City 2 A 25 45 B 20 10 AB 10 5 O 45 40
4.2.1Which blood group has:
4.2.2Plot the data in the table as bar graphs on the same system of
4.3The diagram below shows a cro ssing between a homozygous black mouse -generation was all black. Use the symbols and for the alleles of fur colour and show diagrammatically a genetic cross between mouse
4.4Clones are a group of genetically identical organisms. Explain THREE advantages and THREE disadvantages NO marks will be awarded for answers in the form of flow GRAND TOTAL: (a\ The highest frequency in City