Genes by Year 4

Today we learnt about genes. Dr Fry came in to see us to tell us about genes.

Genes are kept in ‘libraries’ in your body. They can make us look different. Our genes make us who we are. We get our genes from our parents. Your genes decide your hair colour, skin colour, eye colour, if you’re tall or short. Scientist can read what your genes say. We can’t see our genes through a microscope. We share our genes with our families, so we look similar to our families. The further away the relation the less we are likely to look like them.

We learnt about chromosomes and what they look like. Our chromosomes are in pairs. We found out boys have a Y chromosome but girls don’t, they have 2 X’s. The chromosome pairs are shaped in a twist and the pictures we see of them are what artists think they look like.

We learnt that genes can causes things like colourblindness. 1 in 12 boys can have red-green colourblindness and 1 in 200 girls can have red-green colourblindness. There are more boys with this colourblindness because girls have 2 X chromosomes that can replace the problem gene. Genes can cause diseases. Genes can make you have less fingers and thumbs or more fingers and thumbs, if you have an extra finger it’s most likely to happen on your pinky finger.

Some people put jellyfish DNA into mice to make them glow in the dark. Some of us thought this was good but not all of us think this is a good idea to do. ‘Frankenstein food’ is food that’s had its genes changed. Police use DNA to trace the blood samples of criminals.

We learnt that we could be the doctors that find out how to fix DNA and some of us think we’d like to be doctors when we’re older! We know a lot after all of this research we’ve done with Dr Fry!

by Year 4

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