Biology- DNA and cell division

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How many chromosomes are there in a human cell?
23 pairs, 46 in total
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Where do chromosomes come from?
In the nucleus
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What are chromosomes made up of?
They are made up of long DNA molecules
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What is fertalisation?
When a male gamete fuses with a females gamete to produce a new cell
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What is mitosis?
When body cells are divided
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What is meiosis?
When gametes are produced
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What is DNA?
Carries a genetc code that determinds the characteristics of a living thing
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What is a gene?
A short secetion of DNA. It specifies the order in which the amino acids join together
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What are the stages of mitosis?
1) the genetic material is copied 2) The cell divides once to form two gentically identical body cells
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When does mitosis occur?
During growth or to produce replacement cells
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What are gametes?
Sex cells, they contain one set of gentetic information
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What happens when fertalisation occurs?
A single body cell with new pairs of chromosomes are formed. This cell is then divided again by mitosis which creates many cells
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What are the stages of meiosis?
1) Copies of the genetic information are made 2) The cell divids twice to form four gametes
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Other cards in this set

Card 2

Front

Where do chromosomes come from?

Back

In the nucleus

Card 3

Front

What are chromosomes made up of?

Back

Preview of the front of card 3

Card 4

Front

What is fertalisation?

Back

Preview of the front of card 4

Card 5

Front

What is mitosis?

Back

Preview of the front of card 5
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