Gr 12 Genetics and inheritance
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1. Who is considered the 'Father of Genetics'? *
2. A homozygous red rose was crossed with a homozygous yellow rose. The red allele is dominant over the yellow allele. What will the expected phenotype(s) of the F1 offspring be? *
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3. In sheep, the allele for white wool (W) is dominant over the allele for black wool (w). Two heterozygous white sheep are mated. What is the percentage chance that an offspring of these two white sheep will be black? *
4. The pedigree diagram below traces the inheritance of haemophilia in a family. What are the chances that individual 10 and his wife, who is a carrier (not depicted), having a son who is affected? *
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5. In a maternity ward, two newborn boys are mixed up. One baby has blood group A and the other has blood group 0. The mothers, Mrs Smith and Mrs Patel, both think that the baby with blood group 0 belongs to them. Mrs Smith is blood group AB and her husband is blood group B. Mrs Patel is blood group B and Mr Patel is blood group A. To whom does 'Baby 0' belong?     *
6. A forensics team found DNA evidence at the crime scene. They took blood samples from the rape victim and three suspects and analysed them. From the DNA fingerprints below, who committed the crime? *
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7. Which of the following statements is FALSE regarding genetic engineering. *
8. Which of the following are caused by common harmless mutations? *
9. Refer to the pedigree diagram of colour blindness below. What genotype do you expect Thuli and her partner have? *
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10. A red-fruited tomato plant is crossed with a yellow-fruited one and produce 173 offspring, 84 of which are yellow and 89 red. Red fruit colour 'R'is dominant over yellow 'r'. Determine the genotype of the parents. *
11. With reference to the photos below. The top two plants were crossed and the offspring is seen below. Which statement is correct? *
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12. In humans brown eye colour 'B' is dominant over blue eye colour 'b'. A brown-eyed man has a brown-eyed partner. Their first child has blue eyes. Which statement is INCORRECT? *
13. Refer to the image below showing the crossing of a chestnut horse with a white horse, their foal is roan. This is an example of... *
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14. A purebred wingless, red-eyed fruit fly is crossed with a purebred winged sepia-eyed fruit fly to produce the F1 generation. Two of the flies from the F1 generation are mated to produce an F2 generation of flies. Which is INCORRECT regarding the phenotypic ratio of the F2 flies? *
15. What is a gene mutation? *
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