Science - DNA, Natural selection and preservation
A short course covering the basics of DNA, Natural selection and preservation. Ideal for students aged 9 upwards for revision, or for adults wishing to learn more on the subjects
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41 questions
| 🇬🇧 | 🇬🇧 |
| What is an example of a characteristic that is classed as discontinuous variation in humans? | Blood group |
| What is the definition of discontinuous variation? | Features that can only take certain values |
| What are examples of characteristics that are classed as continuous variation in humans? | Weight, height and skin colour |
| What is the definition of continuous variation? | A feature that can vary over a range of values |
| What are the two types of variation that are seen within a species? | Continuous and discontinuous |
| Some characteristics are inherited from your parents, what other factor can affect characteristics? | Environment |
| You will see variation within the same species that basically have the same genes. This difference is a..? | Characteristic feature |
| What happens as a result of the mixture of chromosomes from both the mother and father in a fertilised egg? | A mixture of the parents characteristics are inherited |
| What is the definition of DNA? | A list of chemical instructions on how to build an organism |
| What do genes control? | Our characteristics |
| What happens to the nucleus of an egg during fertilisation? | It merges with the sperm nucleus |
| What is another way that we can prevent animal species becoming extinct? | Preserve their habitat |
| How are genes stored in a gene bank for animals? | Sperms and egg cells are frozen and stored |
| How are genes stored in a gene bank for plants? | Seeds are stored |
| What can a gene bank do if they have the genes of a species that has become endangered or even extinct? | Try to create new members of that species |
| What is the importance of a gene bank? | To maintain biodiversity |
| Why is it important for us to preserve all species on Earth and maintain the planets biodiversity? | To protect our ecosystems |
| What can happen if one species that is part of an ecosystem becomes endangered or extinct? | It can have a knock on effect on other species |
| What can affect the longevity of a species that has otherwise thrived and been able to compete against others sucessfully? | Changes in environment |
| What can happen to a species that cannot compete against other species over a long period of time? | It can become extinct |
| What is the definition of the word extinct? | A species that has died out completely |
| What is the name of the process where a useful characteristic becomes more common, and non-useful ones become less common over time? | Natural selection |
| If organisms with useful characteristics continue to reproduce over time, what happens regarding the useful characteristics? | They become more common |
| What often happens to organisms that are not successful against competitors, which ultimately means their genes are not passed on? | Die before reproducing |