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Inheritance Basic Presentation Transcript

Slide 1 - Inheritance
Slide 2 - Some features are in two forms Some people have ear lobes and others do not. e.g.
Slide 3 - A gene controls how ear lobes develop. There are two versions of the gene. They are called alleles. E which produces ears with lobes. e which produces ears without lobes. and
Slide 4 - The genes are in our cells. Where are they kept? In the nucleus
Slide 5 - The genes are on long, string-like things called chromosomes
Slide 6 - We have 46 of them in our cells. What do you notice about them?
Slide 7 - All our chromosomes are in pairs Where did we get each one from? half came from mum and half came from dad
Slide 8 - This means that genes are in pairs Because… E E Genes are on chromosomes.
Slide 9 - So... forgetting all those chromosomes you might have two lobe alleles EE two no lobe alleles ee or one of each allele Ee but you definitely have 2
Slide 10 - However!
Slide 11 - Sex cells are special when it comes to chromosomes and genes. They only have one of each, not the usual two. Why is this? Sex cells are designed to join together and so... 1 + 1 = 2
Slide 12 - We can use these facts to make predictions about the features that children will inherit from their parents.
Slide 13 - Lets pretend... that a man without ear lobes and a woman with lobes will soon have their first baby Will the baby have ear lobes?
Slide 14 - mum dad parent’s genotype EE ee sex cell’s alleles E e But… does the child have ear lobes? No lobes Lobes Children’s genotype E e Ee
Slide 15 - YES If someone has both versions of the allele… One version’s effect can hide the other’s. The version is... dominant
Slide 16 - Lets see if you have got the idea!
Slide 17 - mum dad parent’s genotype Ee Ee sex cell’s alleles E e But… do the children have ear lobes? Lobes Lobes Children’s genotype E e Ee E e E e Ee EE ee
Slide 18 - EE Ee Ee ee
Slide 19 - Click here to go back to the start. Click here to finish
Slide 20 - This powerpoint was kindly donated to www.worldofteaching.com http://www.worldofteaching.com is home to over a thousand powerpoints submitted by teachers. This is a completely free site and requires no registration. Please visit and I hope it will help in your teaching.