Edexcel B1 Variation

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  1. What is Classification?
    A method of organising living things into groups.
  2. Living things are divided into 5 kingdoms, which two are missing?

    Plants, Animals, ------- , protoctists,---------
    Fungi, Prokaryotes
  3. Animals with a supporting rod in their back, belong to which phylum?
  4. Vertebrates can divided into 5 groups, called classes, can you name them?
    fish, amphibians,reptiles,birds and mammals.
  5. A homeotherm can maintain what?
    Its body temperature, by a process of Homeostasis
  6. There are two types of variation, what are they?
    Genetic and environmental
  7. The different heights of students in a class, is an example of which type of variation?
    Continuous variation
  8. Name three ways a polar bear is adapted to suit it's environment?
    • small surface area to volume ratio - reduces heat loss
    • thick hairy coat - insulates it
    • white fur - provides camouflage
  9. What is the theory evolution?
    how organisms change from one generation to the next
  10. Who came up with the theory of evolution? What was the theory called?
    • Charles Darwin.
    • Natural selection
  11. What is an Allele?
    A different form of the same gene eg if the gene is hair colour the alleles would be blonde, browm and red.
  12. How many chromosomes does a human cell nucleus contain?
    46 = 23 pairs
  13. What do genes control?
    The development of different characteristics eg eye colour
  14. How are dominant alleles represented?
    A Capital letter
  15. Sickle cell anaemia is a genetic disorder, what are the symptoms?
    Sickle shaped red blood cells, Tiredness, painful joints and muscles and fever.
  16. What happens if an individual has one sickle cell allele and one normal?
    Sickle cell trait. Some red blood cells are affected
  17. What does homozygous mean?
    That the individual has two of the same alleles e.g. RR or rr
  18. What does heterozygous mean?
    Has two different alleles e.g. Rr
  19. If a mother has cystic fibrosis and a father is a carrier. What are the chances of their children having cystic fibrosis?
    50% of the children will have cystic fibrosis and the other 50% will be carriers.
  20. What are the symptoms of cystic fibrosis?
    They produce a thick sticky mucus. It can cause breathing problems, increased risk of chest infections, digestive problems and infertility.
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Edexcel B1 Variation
Edexcel B1 Variation
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