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ten4ten - B1
Day 9 Answers
1. Fertilisation is the fusion or joining together of the gametes. It is part of sexual
reproduction.
2. It gives variety i.e. genetic variation in the offspring.
3. Only one parent required no genetic variation.
4. An offspring that is genetically identical to the parent organism.
5. Cuttings and plants from tissue culture have one parent and are genetically identical.
6. Take eggs cell from cow and fertilise with sperm in a dish. Let cells divide to form balls
of cells or embryos which are then split before they become specialised cells. Embryos
grow and then are transplanted into host or surrogate cows that are replacement
mothers good for giving birth. The calves have all come from the same zygote/ embryo
and are therefore a clone.
7. Adult cell cloning.
8. It means taking a gene from one organism and putting it into another.
9. An enzyme.
10
(a) The effect of GM crops on populations of wild flowers and bees. (b) uncertainty
of eating GM foods on human health
Day 10 Questions
1. What does the theory of evolution by natural selection state?
2. Give one reason why the theory of evolution by natural selection was not first accepted
straight away?
3. Who suggested that giraffes got their long necks because during their lifetime the neck
got longer and this characteristic would then be passed onto its offspring.
4. What is meant by the term Survival of the fittest?
5. What is a fossil?
6. What is a mutation?
7. Give an example of evolution by natural selection that involved air pollution in the
1800s.
8. What are thought to be the very earliest life forms on earth?
9. What is meant by the term ’common ancestor?
10.What does studying the similarities and differences between organisms
help us to understand?