B1 End Of Topic Test

24 Questions  I  By As_biology_f211
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 B1 End Of Topic Test
A test to see how much you know about the 21st Century Science topic B1: You and Your Genes.

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Questions and Answers

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  • 1. 
    Mary and Steve are sister and brother. They have both inherited sex chromosomes from their parents. Mary's genotype will be X__.

  • 2. 
    Steve's genotype will be X__.

  • 3. 
    Which of Steve's sex chromosomes did he inherit from his mother?
    • A. 


    • B. 


    • C. 


    • D. 


  • 4. 
    Steve has a twin brother called Dave. Steve and Dave do not look completely like each other. Explain why. [1m]

  • 5. 
    A science class has many students of different heights. Which two factors best explain why? Put ticks in the boxes next to the two best answers.
    • A. 

      The students are all in the same age group.

    • B. 

      Height is controlled by several different genes.

    • C. 

      Height is affected by environmental factors such as lifestyle.

    • D. 

      Height is affected by the number of students in the class.

    • E. 

      All children grow at the same rate.

    • F. 

      The students are all the same sex.

  • 6. 
    Jadzia has similarities to her mother and similarities to her father, but is not identical to either of them. Use your knowledge of genes, sexual reproduction and the environment to explain why. The quality of written communication will be assessed in your answer to this question. [5m+1]

  • 7. 
    Foetuses can be tested to see if they have the alleles that will cause genetic disorders. Which two decisions may parents have to make after the results of a genetic test on the foetus? Tick the two most important decisions. They may decide whether or not to...
    • A. 

      ...have a vaccination.

    • B. 

      ...have the pregnancy terminated.

    • C. 

      ...name the baby after a grandparent.

    • D. 

      ...have an anaesthetic during the baby's birth.

    • E. 

      ...have any more children.

    • F. 

      ...tell the grandparents the sex of the foetus before it is born.

  • 8. 
    Foetuses can be tested by removing a sample of amniotic fluid (the fluid surrouding the baby while it grows in the uterus). The cells found in the fluid can then be tested. There is a 1% chance that this test could result in the mother having a misscarriage.  [3m] Using this informaiton, explain clearly three things that the parents need to think about before they decide whether or not to have the test. 

  • 9. 
    Clones can be produced artificially. A nucleus from a body cell of a donor can be put into an egg cell. Which of the following statements about this type of cloning are true?
    • A. 

      The clone is genetically different to the donor.

    • B. 

      The clone has two nuclei in each cell.

    • C. 

      A new nucleus is placed in an empty egg cell.

    • D. 

      The donor nucleus is removed from an adult body cell.

    • E. 

      The nucleus is removed from an egg cell.

  • 10. 
    Stem cells can also be used to make clones. Which of the following statements are true?
    • A. 

      Embryos can be used to make stem cells.

    • B. 

      Each clone has different DNA.

    • C. 

      Half the clones are male, and half the clones are female.

    • D. 

      The cloned cells never become specialised.

    • E. 

      The stem cells may be used to treat some diseases.

  • 11. 

    This family tree shows the inheritance of Cystic Fibrosis. Fill in the gaps in the sentence below using one of these words. Co-dominant        Dominant        Normal        Recessive Cystic fibrosis is a _____________ genetic disease.

  • 12. 
    Using the family tree from the previous question, which person is a female who has inherited two copies of the cystic fibrosis allele?

  • 13. 
    Using the family tree, name one carrier of the cystic fibrosis allele.

  • 14. 
    Charles and Eva decide that they want to have another child. What is the probabilty that they will have another child who has cystic fibrosis? _____%

  • 15. 
    What is the probabilty that Charles and Eva will have a child who does not carry the cystic fibrosis allele? _____%

  • 16. 
    What is the probabilty that Charles and Eva will have a child who carries the cystic fibrosis allele but does not suffer from the disease? _____%

  • 17. 
    Imagine that you are a genetic counsellor (someone who gives advice to people about genetic diseases. What advice would you give Charles and Eva? [2m]

  • 18. 
    Scientists think embryonic stem cells could be used to treat some illnesses for which there is currently no cure. Complete the sentences about stem cells. Embryonic stem cells can develop into any kind of cell. Therefore, stem cells are described as ____________________________ .

  • 19. 
    During development of multi-cellular organisms, stem cells become____________________________ .

  • 20. 
    The use of human embryos to produce stem cells has caused a lot of arguments. Some people think that using stem cells from human adults would cause fewer arguments. Discuss how using adult stem cells differs from using embryonic stem cells and why this might cause fewer arguments. The quality of written communication will be assessed in your answer to this question. [5m+1]

  • 21. 
    PKU is a genetic disorder. After a science lesson about genetics, some friends discuss what they think genes are. Fiona: All of our characteristics are determined by genes. Pasang: Genes are made from chromosomes. Rachel: Genes are instructions to control how an organism develops and functions. Lionel: Genes are made from DNA and are found in the nucleus of a cell. Write down the names of the two people who make correct statements. answers.....................................................and.......................................................................[1m]

  • 22. 
    Doctors estimate that between 1 in 10 000 and 1 in 12 000 babies born in the UK has PKU. The Office for National Statistics reported that 710 000 babies were born in the UK in 2008. Estimate the lower and upper limits for the number of babies born in the UK in 2008 that you would expect to have PKU. from .......................... to .......................... [1m]

  • 23. 
    Testing a baby for PKU costs the NHS £6. Estimate the upper and lower limits of the cost to the NHS of identifying one baby with PKU. from £.......................... to £......................... [1]

  • 24. 
    Doctors have said that it is right to test all babies for PKU even though it costs the NHS money. Use the information about PKU and your answers to questions 22 and 2to suggest reasons why the doctors have come to this conclusion. [3m]

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