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Extra resources for Crossing Over: The Basics of Evolution - Workbook for Teachers

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What can you say about the genes of Nonhlanhla and Ntombifuthi? 2. What can you say about the genes of Zanele and Zodwa? 9:K:ADEB:CI6C9 ;JC8I>DC>C<D;I=: L=DA:DG<6C>HB Figure 17. The relationship between chromosomes and the whole organism can be summarised in a diagram like this one. Measuring variation We can measure the variation in physical characteristics of a species in many ways. Here are some examples. Table 2 shows the masses of the cobs from one hundred maize plants of a particular variety.

A sperm contains chromosomes with a set of genes from________. An egg (ovum) contains chromosomes with a set of genes from ________. At ________ these two sets of genes are brought together. They control development of the fertilised ovum into ________.  The ________ of two parents inherits genes from both ________. The combination of genes that each individual inherits is unique, which means that each individual of a species is slightly different from all other individuals of its species.

26 Part 1: Understanding Genes and Inheritance HSRC Workbook Even very closely related members of the same species vary in detail. You have probably noticed that children of one mother and father often resemble each other. Sometimes we can tell who a child’s parents are by looking at the child! You have to be a Robertson! You have the Robertson eyes and nose. I can see that you are Themba Mtshali’s brother – you look just like him. You are surely from the Khan family. They are all short and thin like you.

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