Variation and Inhertence

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What are the two types inherited characteristics?
Dominant and recessive.
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What are alleles?
Alleles are different versions of the same gene.
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What do the types inherited characteristics depend on?
Dominant alleles are expressed when present, but recessive alleles are only expressed if the dominant allele is not present.
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How many chromosomes do human body cells have?
23 pairs.
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What do sex chromosomes determine?
A mammal's sex.
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Which sex chromosomes do females have and which sex chromosomes do males have?
Females have identical sex chromosomes - XX chromosomes. Males have different sex chromosomes - XY chromosomes.
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Which sex chromosome does an egg cell carry?
X chromosome.
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Which sex chromosome does a sperm cell carry?
Either X or Y chromosome.
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What is the chance of the offspring being male or female?
Equal - 50/50 chance of offspring being male or female.
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What causes genetic variation?
mutations, rearrangement of genes during the formation of gametes, fertilisation.
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What does a monohybrid cross involve?
Only one pair of characteristics controlled by a single gene, one allele being dominant and one allele being recessive.
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What is homozygous?
Homozygous means that alleles are identical.
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What is hetreozygous?
Heterozygous means that alleles are different.
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What causes inherited disorders?
Faulty genes - mostly recessive faulty alleles.
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How can the probability of inheriting genetic disorders be predicted?
By interpreting genetic diagrams.
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Card 2

Front

What are alleles?

Back

Alleles are different versions of the same gene.

Card 3

Front

What do the types inherited characteristics depend on?

Back

Preview of the front of card 3

Card 4

Front

How many chromosomes do human body cells have?

Back

Preview of the front of card 4

Card 5

Front

What do sex chromosomes determine?

Back

Preview of the front of card 5
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