Chapter 10

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What is meant by the term 'phenotype'?
The physical appearance of the characteristic
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What causes down's syndrome?
An extra chromosome
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Name the cell which results from the fusion of the male and female gamete?
Zygote
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What molecule are genes made of?
DNA
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What are 'alleles'?
Alternative forms of a gene
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Why does sexual reproduction result in variation?
The genetic material form two parents is brought together when the sperm and egg nuclei fuse
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What is meant by a 'heterozygous' individual?
The two alleles are different Dd
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How does a gene control the production of a protein?
The DNA in the gene is made of a sequence of bases. Three bases form the code for a particular amino acid. The sequence of groups of three bases determines the sequence of amino acids in the protein
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How many pairs of chromosomes do humans have?
23 pairs
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What is meant by the term 'genotype'
The genetic make up - which alleles does the individual inherit
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What is meant by a 'homozygous' individual?
The two alleles are the same DD (The recessive gene is little dd)
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Card 2

Front

What causes down's syndrome?

Back

An extra chromosome

Card 3

Front

Name the cell which results from the fusion of the male and female gamete?

Back

Preview of the front of card 3

Card 4

Front

What molecule are genes made of?

Back

Preview of the front of card 4

Card 5

Front

What are 'alleles'?

Back

Preview of the front of card 5
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