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# Lesson 1 Inheritance And Selection Year 9 Sb

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### Lesson 1 Inheritance And Selection Year 9 Sb

1. 1. To day we are going to learn aboutInheritance and Selection<br />What is it?<br />And Why?<br />
2. 2. Starter Activity 1<br />Identical Twins<br />In pairs:<br />Discuss what is meant by Identical Twins?<br /> Find out the similarities and discuss your answers.<br />2 minutes<br />
3. 3. Learning Objectives<br />At the end of the lesson:<br />To know :-<br /> offspring are similar but not identical to their parents. <br /> some characteristics are inherited and these variations occur in both plants and animals .<br />
4. 4. Key words<br />Inheritance, selection, variation, acquired, identical twins, environment, <br />
5. 5. Activity 2; measurement of height variation<br />In groups of 3 measure your heights (cm).<br /><ul><li>Use an appropriate graph to give you a better picture of your results. </li></li></ul><li>Variation<br />Activity 3<br />Look carefully, Do the children share the same characteristics with the parents?<br />
6. 6. Variation<br />Look closely at the picture below. Do the children share<br />any features or characteristics with their parents?<br />
7. 7. Variation<br />Look closely at the picture below. Do the children share<br />any features or characteristics with their parents?<br />
8. 8. Activity 4<br />In groups of three.<br />Discuss the ways humans differ from each other.<br />Variation?<br />
9. 9. The ways Humans varies<br />Eye colour<br />Strength<br />Height<br />Hair colour<br />Weight<br />Personality<br />Ear lobs<br />Ability to speak English<br />Intelligent<br />Blood groups<br />Speed<br />Sex<br />Shin colour<br />Fingerprint<br />Fitness<br />Stamina<br />Variation?<br />
10. 10. Variation<br />In general we can see that children are similar, but not identical, to their parents. Differences occur because children inherit characteristics from boththeir parents and they can be affected by their environment. This is true for both animalsand plants.<br />Variation can come about for two reasons:<br />Some features can be inherited. That means that you get them from your parents.<br />Other characteristics are affected by the environment.<br />
11. 11. So what causes variation?<br />Remember back to the photo of the group of people. They are in fact all RELATED. So you might notice things about them that are quite similar. That is because some of their features were inherited from their parents.<br />But do they look exactly alike?<br />
12. 12. So what causes variation?<br />There are two reasons for this:<br />Firstly humans reproduce via sexual reproduction. <br />This involves the fusion of the male sex cell and the female sex cell. <br />The nucleus in these sex cells contains information about the parents. This cannot happen the same way twice. This makes each individual unique, of course they don’t! There are two reasons for this:<br />Animals and plants which reproduce sexually therefore transfer characteristics to their offspring through the nuclei of the sex cells in the same way. This means that these offspring are also unique.<br />
13. 13. So what causes variation?<br />What characteristics can be inherited or acquired by the environment or determined by inheritance and environment?<br />Activity 5<br />In groups of three sort out the characteristics that can be inherit or acquired by the environment or determined by inheritance and environment?<br />
14. 14. So what causes variation?<br />characteristics inherited, acquired by the environment or determined by inheritance and environment<br />
15. 15. So what causes variation?<br />Secondly some features are caused by conditions in your surroundings. For example your parents might be tall, but, if you don’t get all the food you need you might not be tall at all! <br />Additionally think of a runner. They need speed and stamina. These things are not inherited – they are improved by training and diet.<br />These features are called environmental.<br />
16. 16. Plenary<br />At the end of the lesson:<br /> all pupils should be able to explain Inheritance and Selection.<br />most pupils should have learnt that offspring are similar but not identical to their parents. <br />Some pupils should have learnt that some characteristics are inherited and that these variations occur in both plants and animals <br />