Mutations (changes to the genes), gamete formation or fertilisation
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How many pairs of chromosomes do normal human body cells have?
23 pairs
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What are alleles?
Different versions of the same gene
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How is sex determined in humans?
** for female (sex chromosomes) and XY for male (sex chromosomes) - A sperm carries an X or Y chromosome and all eggs carry ** chromosomes
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What are dominant and recessive alleles dependent on?
Dominant or recessive alleles
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How are recessive alleles expressed?
Only if the dominant allele is absent
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What does heterozygous mean?
Having 2 different alleles
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What does homozygous mean?
Having 2 identical alleles
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What is the genotype?
The genetic makeup of a person
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What is the phenotype?
The alleles/characteristics expressed
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What are inherited disorders caused by?
Faulty genes
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What are the personal and ethical issues of knowledge of inherited disorders?
A genetic test could alter lifestyle,career and insurance and knowing all the risks of an inherited disorder affect you want to marry and start a family
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What type of alleles are inherited disorders caused by?
Faulty alleles, most of which are recessive
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Other cards in this set
Card 2
Front
How many pairs of chromosomes do normal human body cells have?
Back
23 pairs
Card 3
Front
What are alleles?
Back
Card 4
Front
How is sex determined in humans?
Back
Card 5
Front
What are dominant and recessive alleles dependent on?
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