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PiXL GetIT!
GCSE Biology
Topic – Genetics   
© Copyright The PiXL Club Ltd, 2017
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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?
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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?
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What is the scientific name for a sex cell?
Egg
Sperm
Zygote
Gamete

10. How many chromosomes in a gamete?
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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?
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Which pair of alleles represent homozygous? BB Bb bb bB

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