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© Copyright The PiXL Club Ltd, 2017

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1 © Copyright The PiXL Club Ltd, 2017
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GCSE Biology Topic – Genetics    © Copyright The PiXL Club Ltd, 2017 This resource is strictly for the use of member schools for as long as they remain members of The PiXL Club. It may not be copied, sold nor transferred to a third party or used by the school after membership ceases. Until such time it may be freely used within the member school. All opinions and contributions are those of the authors. The contents of this resource are not connected with nor endorsed by any other company, organisation or institution. The PiXL Club Ltd, Company number

2 GetIT – Genetics Your genes are a set of instructions for the growth and development of every cell in your body. Genes are made up of deoxyribonucleic acid (DNA). DNA is a long molecule and it contains the instructions to make a particular protein, in a particular cell, at a particular time. Genes are packaged in bundles called chromosomes. In humans, each cell in the body contains 23 pairs of chromosomes – 46 in total. You inherit one of each pair of chromosomes from your mother and one from your father. This means there are two copies of every gene in each cell, with the exception of the sex chromosomes, X and Y.

3 Match IT Gamete Chromosome Gene Genotype Phenotype Dominant Recessive
A structure that is made of DNA and is found in the nucleus Chromosome Where a characteristic is expressed if both copies are present Gene Sex cells such as sperm and egg Genotype The alleles present Phenotype A small section of DNA Dominant Where an allele is always expressed even if only one is present Recessive The two alleles are different Bb Allele Different form of the gene Homozygous The alleles that are expressed Heterozygous The two alleles are the same e.g. BB or bb

4 Match IT - Answers Gamete Chromosome Gene Genotype Phenotype Dominant
Sex cells such as sperm and egg Chromosome A structure that is made of DNA and is found in the nucleus Gene A small section of DNA Genotype The alleles present Phenotype The alleles that are expressed Dominant Where an allele is always expressed even if only one is present Recessive Where a characteristic is expressed if both copies are present Allele Different form of the gene Homozygous The two alleles are the same e.g. BB or bb Heterozygous The two alleles are different Bb

5 Label IT

6 Cell Allele Chromosome Nucleus Gene

7 What is a gene? Multiple choice quiz Something you get from one parent
Get IT Multiple choice quiz What is a gene? Something you get from one parent A small section of DNA You have 23 pairs in the nucleus All of them

8 How many chromosomes are in a normal adult human cell?
Get IT How many chromosomes are in a normal adult human cell? 23 23 pairs 46 46 pairs

9 What is the scientific name for a sex cell?
Get IT What is the scientific name for a sex cell? Egg Sperm Zygote Gamete

10 How many chromosomes in a gamete?
Get IT How many chromosomes in a gamete? 23 23 pairs 46 46 pairs

11 Get IT If an organism has a dominant and recessive allele, which allele will be displayed in the phenotype? Dominant Both of them Recessive None of them

12 Which pair of alleles represent homozygous?
Get IT Which pair of alleles represent homozygous? BB Bb bb bB

13 Which pair of alleles represent heterozygous?
Get IT Which pair of alleles represent heterozygous? BB Bb bb bB


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