Inheritance

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Author:
Anonymous
ID:
62948
Filename:
Inheritance
Updated:
2011-01-30 14:45:34
Tags:
Biology Inheritance
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Description:
Standard Grade Biology - Inheritance
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  1. What is a species?
    A species is a group of living organisms who are so similar to each other that they are able to interbreed and produce fertile offspring
  2. What are the two types of variation?
    Continuous and discontinuous
  3. Define continuous variation and give an example
    • Continuous variation is when a characteristic varies from one extreme to another in a smooth, continuous way.
    • Examples: height, weight and pulse rate
  4. Define discontinous variation and give an example
    • Discontinous variation is when a characteristic can be divided into two or more distinct groups.
    • Examples: eye colour, blood groups and fingerprint types
  5. How can continuous variation be shown?
    On a histogram or a line graph
  6. How can discontinuous variation be shown?
    On a bar graph or a pie chart
  7. Sex cells are called ______?
    gametes
  8. What are the tiny units along chromosomes called?
    genes
  9. Genes can either be......?
    dominant of recessive
  10. What is an organisms genotype?
    The set of genes an organism possesses
  11. What is an organisms phenotype?
    What an organism actually looks like
  12. If a child is female what set of chromosomes will it have?
    XX
  13. If a child is male what set of chromosomes will it have?
    XY
  14. What are different forms of a gene called?
    Alleles
  15. What is the normal phenotype ratio in the F2 generation?
    3 : 1
  16. Why is the real ratio often different from the predicted ratio?
    As fertilisation is a random process
  17. What is a mutation?
    A change in the chemical structure of a gene or chromosome
  18. What can be used to detect chromosome mutations in an embyo?
    Amniocentesis
  19. What factors can increase muations?
    • Radiation (X-rays, Ultraviolet light)
    • Mutagens eg tobacco
  20. When an organism possess two identical forms of a gene it is said to be _________?
    homozygous
  21. When an organism possess two different forms of a gene it is said to be ________?
    heterozygous
  22. In selective breeding organisms with ______ ______ are bred together?
    desirable characteristics
  23. Give an example of selective breeding
    • Cereal crops being bred to be more resistant to disease
    • Cows being bred to produce more milk
    • Sheep being bred to produce more wool

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