Genetics

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How many chromosomes does a human body cell have?
46
1 of 20
Which pair of chromosomes does a female have?
**
2 of 20
Which pair of chromosomes does a male have?
xy
3 of 20
How many chromosomes does a human egg cell have?
23
4 of 20
How many chromosomes does a sperm cell have?
23
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What is a gene?
the basic physical and functional unit of hereditary
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What chemical makes DNA?
DNA
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What are alleles?
Forms of a gene
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What is a genotype?
The gender content which is either ** or xy
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What is a phenotype?
physical characteristics of an organism
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What does recessive mean?
an alele which only shows if the individual has two copies of the recessive allele.
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What does the term dominant mean?
An allele which always shows.
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What does heterozygous mean?
When two alleles are different Rr
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What does homozygous mean?
When two alleles are the same rr
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What is variation?
A modification in structure, form or function in an organism, deviating from other organisms of the same species or group
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What are the types of variation?
Genetic eg cystic fibrosis and environmental eg body mass
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What is selective breeding?
breeding plants and animals for particular traits
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Who does the selecting in selective breeding?
humans
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What is natural selection?
organisms which possess certain genetic characteristics that make them better adjusted to the environment increase in number,survive,reproduce and pass down successful genes
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What does the natural selecting?
The environment
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Card 2

Front

Which pair of chromosomes does a female have?

Back

**

Card 3

Front

Which pair of chromosomes does a male have?

Back

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Card 4

Front

How many chromosomes does a human egg cell have?

Back

Preview of the front of card 4

Card 5

Front

How many chromosomes does a sperm cell have?

Back

Preview of the front of card 5
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