Variation and Evolution

1) The image below shows a liger, which is a cross between a female lion and a male tiger. The liger will have inherited characteristics from both parents. As the liger is a hybrid animal, it is unlikely that it will be able to have offspring via sexual reproduction. Suggest why 1 Marks

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2) In the past, lions and tigers would have appeared to look very similar. However, over time, they have become more and more different. For example, tigers now have striped fur, whereas lions have solid coloured fur. Explain why the characteristics of species change over time 4 Marks

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3) Scientists could produce more ligers from this liger through a process known as adult cell cloning. The process would require one male liger, and two female lions. Explain how these individuals would be used to produce more ligers 6 Marks

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4) Currently, genetic engineering is more commonly used in plants, however there are still concerns surrounding their use. Suggest why some people may have ethical considerations surrounding genetically modified crops 1 Marks

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5) Explain how genetic engineering of crops is performed by scientists 3 Marks

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6) Selective breeding is a cheaper and easier way for farmers to increase their yield. Outline the process of selective breeding, and give one advantage and one disadvantage to its use 4 Marks

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