B1 Variation and inheritance

Inherited human characteristics can be -------- or ----------
Dominant or recessive
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What are alleles?
Different versions of the same gene
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What do dominant and recessive characteristics depend on?
Dominant and recessive alleles
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When are dominant and recessive alleles expressed?
Dominant alleles - when present & Recessive alleles- only in the absence of the dominant allele
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How many pairs of chromosomes do human cells have?
23 pairs
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What determines sex in mammals?
Sex chromosomes
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Name of female sex chromosomes...
XX
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Name of male sex chromosomes...
XY
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Sperm will carry which chromosome?
Either X or Y
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Eggs will carry which chromosome?
X
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Why is there an equal chance of the offspring being male or female?
There is a random chance of which sperm fertilises an egg
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Genetic variation is caused by...
Mutations (random changes in genes or chromosomes)
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Genetic variation is caused by...
Rearrangement of genes during the formation of gametes
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Genetic variation is caused by...
Fertilisation (results in a zygote with alleles from mother and father)
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What does a monohybrid cross involve?
Involves only one pair of characteristics controlled by a single cell (1 dominant and 1 recessive allele)
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What does homozygous mean?
Having identical alleles
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What does heterozygous mean?
Having different alleles
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What is a person's genotype?
Their genetic make-up
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What is a person's phenotype?
Which alleles are expressed
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What causes inherited disorders?
Faulty genes (most are recessive)
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How do you predict the probability of inheriting certain disorders?
By interpreting genetic diagrams
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Other cards in this set

Card 2

Front

Different versions of the same gene

Back

What are alleles?

Card 3

Front

Dominant and recessive alleles

Back

Preview of the back of card 3

Card 4

Front

Dominant alleles - when present & Recessive alleles- only in the absence of the dominant allele

Back

Preview of the back of card 4

Card 5

Front

23 pairs

Back

Preview of the back of card 5
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